Vulnerability-Lookup

CVE-2026-54764 (GCVE-0-2026-54764)

Vulnerability from cvelistv5 – Published: 2026-07-06 20:20 – Updated: 2026-07-07 14:03

Title

ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-07 14:03 UTC

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7712 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/traefik/traefik/security/advis…	x_refsource_CONFIRM
https://github.com/traefik/traefik/pull/13344	x_refsource_MISC
https://github.com/traefik/traefik/commit/7ae92d8…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
traefik	traefik	Affected: < 2.11.51 Affected: >= 3.0.0, < 3.6.22 Affected: >= 3.7.0, < 3.7.6	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54764",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-07T14:03:07.994154Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-07T14:03:17.886Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "traefik",
          "vendor": "traefik",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.51"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.6.22"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.7.0, \u003c 3.7.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik\u0027s ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-06T20:20:29.345Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m"
        },
        {
          "name": "https://github.com/traefik/traefik/pull/13344",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/traefik/traefik/pull/13344"
        },
        {
          "name": "https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d"
        }
      ],
      "source": {
        "advisory": "GHSA-3q9r-p662-5j8m",
        "discovery": "UNKNOWN"
      },
      "title": "ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54764",
    "datePublished": "2026-07-06T20:20:29.345Z",
    "dateReserved": "2026-06-15T23:12:41.966Z",
    "dateUpdated": "2026-07-07T14:03:17.886Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-54764",
      "date": "2026-10-15",
      "epss": "0.00281",
      "percentile": "0.19163"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "traefik",
                "vendor": "traefik",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.11.51"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 3.0.0, \u003c 3.6.22"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 3.7.0, \u003c 3.7.6"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "5AEF8E00-6A9F-4F16-BEC2-9CCF183AC647",
                    "versionEndExcluding": "2.11.51",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "A035A58C-BBD8-4E57-B6F3-A42E2F9CC4BC",
                    "versionEndExcluding": "3.6.22",
                    "versionStartIncluding": "3.0.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "359A11C2-8FAA-436F-BB24-C2B166473FDC",
                    "versionEndExcluding": "3.7.6",
                    "versionStartIncluding": "3.7.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik\u0027s ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6."
          }
        ],
        "id": "CVE-2026-54764",
        "lastModified": "2026-07-08T03:01:46.417",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.8,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 6.9,
                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "LOW",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-54764",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-07T14:03:07.994154Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-07-06T21:16:56.930",
        "references": [
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Patch"
            ],
            "url": "https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Issue Tracking"
            ],
            "url": "https://github.com/traefik/traefik/pull/13344"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-345"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-24T12:56:19+00:00",
      "cve": "CVE-2026-54764",
      "id": "CVE-2026-54764",
      "initial_release_date": "2026-07-06T20:20:29.345000+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "traefik: Traefik: Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54764.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-54764",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-07T14:03:07.994154Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-07T14:03:14.403Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "traefik",
              "vendor": "traefik",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 2.11.51"
                },
                {
                  "status": "affected",
                  "version": "\u003e= 3.0.0, \u003c 3.6.22"
                },
                {
                  "status": "affected",
                  "version": "\u003e= 3.7.0, \u003c 3.7.6"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik\u0027s ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 6.9,
                "baseSeverity": "MEDIUM",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "LOW",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-345",
                  "description": "CWE-345: Insufficient Verification of Data Authenticity",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-06T20:20:29.345Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m"
            },
            {
              "name": "https://github.com/traefik/traefik/pull/13344",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/traefik/traefik/pull/13344"
            },
            {
              "name": "https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d"
            }
          ],
          "source": {
            "advisory": "GHSA-3q9r-p662-5j8m",
            "discovery": "UNKNOWN"
          },
          "title": "ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-54764",
        "datePublished": "2026-07-06T20:20:29.345Z",
        "dateReserved": "2026-06-15T23:12:41.966Z",
        "dateUpdated": "2026-07-06T20:20:29.345Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

CERTFR-2026-AVI-0823

Vulnerability from certfr_avis - Published: 2026-07-02 - Updated: 2026-07-02

De multiples vulnérabilités ont été découvertes dans Traefik. Elles permettent à un attaquant de provoquer un contournement de la politique de sécurité.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Traefik	Traefik	Traefik versions v3.6.x antérieures à v3.6.22
Traefik	Traefik	Traefik versions v2.11.x antérieures à v2.11.51
Traefik	Traefik	Traefik versions v3.7.x antérieures à v3.7.6

References

Title

Publication Time

FKIE_CVE-2026-54764

Vulnerability from fkie_nvd - Published: 2026-07-06 21:16 - Updated: 2026-07-08 03:01

Severity

5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d	Patch
security-advisories@github.com	https://github.com/traefik/traefik/pull/13344	Issue Tracking
security-advisories@github.com	https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m	Patch, Vendor Advisory

Impacted products

Vendor	Product	Version
traefik	traefik	*
traefik	traefik	*
traefik	traefik	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "traefik",
          "vendor": "traefik",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.51"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.6.22"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.7.0, \u003c 3.7.6"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5AEF8E00-6A9F-4F16-BEC2-9CCF183AC647",
              "versionEndExcluding": "2.11.51",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A035A58C-BBD8-4E57-B6F3-A42E2F9CC4BC",
              "versionEndExcluding": "3.6.22",
              "versionStartIncluding": "3.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "359A11C2-8FAA-436F-BB24-C2B166473FDC",
              "versionEndExcluding": "3.7.6",
              "versionStartIncluding": "3.7.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik\u0027s ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6."
    }
  ],
  "id": "CVE-2026-54764",
  "lastModified": "2026-07-08T03:01:46.417",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "LOW",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-54764",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-07T14:03:07.994154Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-06T21:16:56.930",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/traefik/traefik/pull/13344"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-3Q9R-P662-5J8M

Vulnerability from github – Published: 2026-08-06 16:38 – Updated: 2026-08-06 16:38

Summary

Traefik: ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false

Details

Summary

There is a medium severity vulnerability in Traefik's ForwardAuth middleware. Even when configured with trustForwardHeader: false, Traefik derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the auth service, bypassing port-based authorization checks. This is a regression of the incomplete fix for GHSA-6384-m2mw-rf54, which addressed the X-Forwarded-Proto and X-Forwarded-Prefix spoofing vectors but missed the X-Forwarded-Port vector.

Patches

https://github.com/traefik/traefik/releases/tag/v2.11.51
https://github.com/traefik/traefik/releases/tag/v3.6.22
https://github.com/traefik/traefik/releases/tag/v3.7.6

For more information

If you have any questions or comments about this advisory, please open an issue.

Original Description ### Summary The ForwardAuth middleware, even when configured with `trustForwardHeader: false`, still derives the `X-Forwarded-Port` header sent to the authentication service by reading the **attacker-controlled** `X-Forwarded-Proto` header from the original incoming request. This allows an unauthenticated remote attacker to cause Traefik to forward `X-Forwarded-Port: 443` to the auth service on a plain HTTP connection, creating an inconsistency that can bypass port-based authorization checks. ### Details The fix introduced in commit `5e1de2258` (released as part of the April 2026 security advisory GHSA-6384-m2mw-rf54) correctly strips all X-Forwarded-* headers from the forwarded auth request when `trustForwardHeader=false`, and reconstructs `X-Forwarded-Proto` from the actual TLS state of the connection (`req.TLS`). However, the reconstruction of `X-Forwarded-Port` is delegated to the helper `forwardedPort(req)` which receives the **original request** (`req`) rather than the sanitized forward request (`forwardReq`): ```go // pkg/middlewares/auth/forward.go – writeHeader() if !trustForwardHeader { forwardedheaders.DeleteXForwardedHeaders(forwardReq.Header) // strips all X-Fwd-* from forwardReq } // ... if _, ok := forwardReq.Header[forwardedheaders.XForwardedPort]; !ok { forwardReq.Header.Set(forwardedheaders.XForwardedPort, forwardedPort(req)) // ← req = ORIGINAL } // pkg/middlewares/auth/forward.go – forwardedPort() func forwardedPort(req *http.Request) string { if _, port, err := net.SplitHostPort(req.Host); err == nil && port != "" { return port } // Reads attacker-controlled header on the ORIGINAL request: if req.Header.Get(forwardedheaders.XForwardedProto) == "https" || ... { return "443" } if req.TLS != nil { return "443" } return "80" } Result when trustForwardHeader=false and attacker sends X-Forwarded-Proto: https on a plain HTTP connection: ┌──────────────────────────────────┬──────────┬────────┐ │ Header forwarded to auth service │ Expected │ Actual │ ├──────────────────────────────────┼──────────┼────────┤ │ X-Forwarded-Proto │ http │ http ✓ │ ├──────────────────────────────────┼──────────┼────────┤ │ X-Forwarded-Port │ 80 │ 443 ✗ │ └──────────────────────────────────┴──────────┴────────┘

  The inconsistency between Proto=http and Port=443 is exploitable against any
  authentication service that gates access based on X-Forwarded-Port.

  ### PoC

  Traefik configuration:

  ```http:
    middlewares:
      my-auth:
        forwardAuth:
          address: "http://auth-service/"
          trustForwardHeader: false  # security setting, but still bypassable
    routers:
      api:
        rule: "PathPrefix(`/api`)"
        middlewares:
          - my-auth
        service: backend

  Auth service logic (example victim):
  # auth-service checks: only port 443 requests are considered "secure"
  port = request.headers.get("X-Forwarded-Port", "80")
  proto = request.headers.get("X-Forwarded-Proto", "http")
  if port == "443":
      return 200  # grant access
  return 403

Attack: Plain HTTP connection, no TLS – but spoofs port 443 curl -H "X-Forwarded-Proto: https" http://traefik.example.com/api/admin Auth service receives X-Forwarded-Port: 443 → grants access Verification: Enable Traefik debug logging and observe X-Forwarded-Port: 443 in the auth request while the connection is plain HTTP. ### Impact Any deployment using the ForwardAuth middleware with trustForwardHeader: false where the downstream authentication service uses X-Forwarded-Port to make authorization decisions is vulnerable to privilege escalation. An unauthenticated attacker can bypass port-based security checks (e.g., "only allow requests arriving on HTTPS port 443") by injecting a single X-Forwarded-Proto: https header on a plain HTTP connection. This is a regression of the incomplete fix for GHSA-6384-m2mw-rf54: while the X-Forwarded-Prefix and X-Forwarded-Proto spoofing vectors were addressed, the X-Forwarded-Port vector was missed.

Severity

5.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.11.50"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.51"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.6.21"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.7.5"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.7.0"
            },
            {
              "fixed": "3.7.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.7.34"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54764"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-06T16:38:29Z",
    "nvd_published_at": "2026-07-06T21:16:56Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThere is a medium severity vulnerability in Traefik\u0027s ForwardAuth middleware. Even when configured with `trustForwardHeader: false`, Traefik derives the `X-Forwarded-Port` header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an `X-Forwarded-Proto: https` header over a plain HTTP connection and cause Traefik to forward `X-Forwarded-Port: 443` to the auth service, bypassing port-based authorization checks. This is a regression of the incomplete fix for GHSA-6384-m2mw-rf54, which addressed the `X-Forwarded-Proto` and `X-Forwarded-Prefix` spoofing vectors but missed the `X-Forwarded-Port` vector.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.51\n- https://github.com/traefik/traefik/releases/tag/v3.6.22\n- https://github.com/traefik/traefik/releases/tag/v3.7.6\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n\u003cdetails\u003e\n\u003csummary\u003eOriginal Description\u003c/summary\u003e\n\n### Summary\n\n  The ForwardAuth middleware, even when configured with `trustForwardHeader: false`,\n  still derives the `X-Forwarded-Port` header sent to the authentication service by\n  reading the **attacker-controlled** `X-Forwarded-Proto` header from the original\n  incoming request. This allows an unauthenticated remote attacker to cause Traefik\n  to forward `X-Forwarded-Port: 443` to the auth service on a plain HTTP connection,\n  creating an inconsistency that can bypass port-based authorization checks.\n\n  ### Details\n\n  The fix introduced in commit `5e1de2258` (released as part of the April 2026 security\n  advisory GHSA-6384-m2mw-rf54) correctly strips all X-Forwarded-* headers from the\n  forwarded auth request when `trustForwardHeader=false`, and reconstructs\n  `X-Forwarded-Proto` from the actual TLS state of the connection (`req.TLS`).\n\n  However, the reconstruction of `X-Forwarded-Port` is delegated to the helper\n  `forwardedPort(req)` which receives the **original request** (`req`) rather than\n  the sanitized forward request (`forwardReq`):\n\n  ```go\n  // pkg/middlewares/auth/forward.go \u2013 writeHeader()\n  if !trustForwardHeader {\n      forwardedheaders.DeleteXForwardedHeaders(forwardReq.Header) // strips all X-Fwd-* from forwardReq\n  }\n  // ...\n  if _, ok := forwardReq.Header[forwardedheaders.XForwardedPort]; !ok {\n      forwardReq.Header.Set(forwardedheaders.XForwardedPort, forwardedPort(req)) // \u2190 req = ORIGINAL\n  }\n\n  // pkg/middlewares/auth/forward.go \u2013 forwardedPort()\n  func forwardedPort(req *http.Request) string {\n      if _, port, err := net.SplitHostPort(req.Host); err == nil \u0026\u0026 port != \"\" {\n          return port\n      }\n      // Reads attacker-controlled header on the ORIGINAL request:\n      if req.Header.Get(forwardedheaders.XForwardedProto) == \"https\" || ... {\n          return \"443\"\n      }\n      if req.TLS != nil {\n          return \"443\"\n      }\n      return \"80\"\n  }\n\n  Result when trustForwardHeader=false and attacker sends X-Forwarded-Proto: https\n  on a plain HTTP connection:\n\n  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n  \u2502 Header forwarded to auth service \u2502 Expected \u2502 Actual \u2502\n  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n  \u2502 X-Forwarded-Proto                \u2502 http     \u2502 http \u2713 \u2502\n  \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n  \u2502 X-Forwarded-Port                 \u2502 80       \u2502 443 \u2717  \u2502\n  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n```\n  The inconsistency between Proto=http and Port=443 is exploitable against any\n  authentication service that gates access based on X-Forwarded-Port.\n\n  ### PoC\n\n  Traefik configuration:\n\n  ```http:\n    middlewares:\n      my-auth:\n        forwardAuth:\n          address: \"http://auth-service/\"\n          trustForwardHeader: false  # security setting, but still bypassable\n    routers:\n      api:\n        rule: \"PathPrefix(`/api`)\"\n        middlewares:\n          - my-auth\n        service: backend\n\n  Auth service logic (example victim):\n  # auth-service checks: only port 443 requests are considered \"secure\"\n  port = request.headers.get(\"X-Forwarded-Port\", \"80\")\n  proto = request.headers.get(\"X-Forwarded-Proto\", \"http\")\n  if port == \"443\":\n      return 200  # grant access\n  return 403\n```\n  Attack:\n\n  Plain HTTP connection, no TLS \u2013 but spoofs port 443\n  curl -H \"X-Forwarded-Proto: https\" http://traefik.example.com/api/admin\n  Auth service receives X-Forwarded-Port: 443 \u2192 grants access\n\n  Verification: Enable Traefik debug logging and observe X-Forwarded-Port: 443\n  in the auth request while the connection is plain HTTP.\n\n ### Impact\n\n  Any deployment using the ForwardAuth middleware with trustForwardHeader: false where\n  the downstream authentication service uses X-Forwarded-Port to make authorization\n  decisions is vulnerable to privilege escalation. An unauthenticated attacker can\n  bypass port-based security checks (e.g., \"only allow requests arriving on HTTPS port\n  443\") by injecting a single X-Forwarded-Proto: https header on a plain HTTP\n  connection.\n\n  This is a regression of the incomplete fix for GHSA-6384-m2mw-rf54: while the\n  X-Forwarded-Prefix and X-Forwarded-Proto spoofing vectors were addressed, the\n  X-Forwarded-Port vector was missed.\n\n\u003c/details\u003e\n\n---",
  "id": "GHSA-3q9r-p662-5j8m",
  "modified": "2026-08-06T16:38:29Z",
  "published": "2026-08-06T16:38:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54764"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/pull/13344"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/traefik/traefik"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.51"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.6.22"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.7.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Traefik: ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false"
}

OPENSUSE-SU-2026:11243-1

Vulnerability from csaf_opensuse - Published: 2026-07-09 00:00 - Updated: 2026-09-17 17:14

Summary

traefik2-2.11.52-1.1 on GA media

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2026-54764.

CVE-2026-54764

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Recommended: 4 products

Open the full advisory

OPENSUSE-SU-2026:11251-1

Vulnerability from csaf_opensuse - Published: 2026-07-10 00:00 - Updated: 2026-09-17 17:14

Summary

traefik-3.7.7-1.1 on GA media

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2026-54764.

CVE-2026-54764

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Recommended: 4 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-54764 (GCVE-0-2026-54764)

CERTFR-2026-AVI-0823

Solutions

FKIE_CVE-2026-54764

GHSA-3Q9R-P662-5J8M

Summary

Patches

For more information

OPENSUSE-SU-2026:11243-1

OPENSUSE-SU-2026:11251-1

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour