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    2 vulnerabilities found for helm-charts by Mailu

    CVE-2026-85751 (GCVE-0-2026-85751)

    Vulnerability from nvd – Published: 2026-09-21 15:39 – Updated: 2026-09-21 17:56
    VLAI
    Title
    Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust
    Summary
    Mailu is a mail server distributed as a set of Docker images. From Mailu 2.0 until 2024.06.55 and prior to Mailu helm-charts 2.7.3, deployments with PROXY_AUTH_WHITELIST configured but REAL_IP_HEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The proxy_hide_header directive in the nginx template at core/nginx/conf/proxy.conf hid the header from upstream responses but did not overwrite the incoming request value in this configuration. An unauthenticated remote attacker could therefore spoof the trusted proxy identity and bypass authentication. This issue is fixed in Mailu 2024.06.55 and Mailu helm-charts 2.7.3.
    Severity
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-21 17:56 UTC
    CWE
    • CWE-290 - Authentication Bypass by Spoofing
    • CWE-807 - Reliance on Untrusted Inputs in a Security Decision
    Assigner
    References
    Impacted products
    Vendor Product Version
    Mailu Mailu Affected: >= 2.0.0, < 2024.06.55
    		Create a notification for this product.
    Mailu helm-charts Affected: < 2.7.3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-85751",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-21T17:56:04.999383Z",
                "version": "2.0.3"
              },
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-21T17:56:14.484Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Mailu",
          "vendor": "Mailu",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2024.06.55"
            }
          ]
        },
        {
          "product": "helm-charts",
          "vendor": "Mailu",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.7.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailu is a mail server distributed as a set of Docker images. From Mailu 2.0 until 2024.06.55 and prior to Mailu helm-charts 2.7.3, deployments with PROXY_AUTH_WHITELIST configured but REAL_IP_HEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The proxy_hide_header directive in the nginx template at core/nginx/conf/proxy.conf hid the header from upstream responses but did not overwrite the incoming request value in this configuration. An unauthenticated remote attacker could therefore spoof the trusted proxy identity and bypass authentication. This issue is fixed in Mailu 2024.06.55 and Mailu helm-charts 2.7.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-807",
              "description": "CWE-807: Reliance on Untrusted Inputs in a Security Decision",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T15:39:24.774Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Mailu/Mailu/security/advisories/GHSA-rfhj-4wcq-74xg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Mailu/Mailu/security/advisories/GHSA-rfhj-4wcq-74xg"
        },
        {
          "name": "https://github.com/Mailu/Mailu/pull/4070",
          "tags": [
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          "url": "https://github.com/Mailu/Mailu/pull/4070"
        },
        {
          "name": "https://github.com/Mailu/Mailu/pull/4071",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Mailu/Mailu/pull/4071"
        },
        {
          "name": "https://github.com/Mailu/Mailu/commit/dffa97cbd889ab208246372ce9c86e99abb27ae9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Mailu/Mailu/commit/dffa97cbd889ab208246372ce9c86e99abb27ae9"
        },
        {
          "name": "https://github.com/Mailu/Mailu/commit/ff4003d045753013470945336448dbd790cac778",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Mailu/Mailu/commit/ff4003d045753013470945336448dbd790cac778"
        },
        {
          "name": "https://github.com/Mailu/Mailu/releases/tag/2024.06.55",
          "tags": [
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          "url": "https://github.com/Mailu/Mailu/releases/tag/2024.06.55"
        }
      ],
      "source": {
        "advisory": "GHSA-rfhj-4wcq-74xg",
        "discovery": "UNKNOWN"
      },
      "title": "Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-85751",
    "datePublished": "2026-09-21T15:39:24.774Z",
    "dateReserved": "2026-09-04T14:50:16.721Z",
    "dateUpdated": "2026-09-21T17:56:14.484Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-85751 (GCVE-0-2026-85751)

    Vulnerability from cvelistv5 – Published: 2026-09-21 15:39 – Updated: 2026-09-21 17:56
    VLAI
    Title
    Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust
    Summary
    Mailu is a mail server distributed as a set of Docker images. From Mailu 2.0 until 2024.06.55 and prior to Mailu helm-charts 2.7.3, deployments with PROXY_AUTH_WHITELIST configured but REAL_IP_HEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The proxy_hide_header directive in the nginx template at core/nginx/conf/proxy.conf hid the header from upstream responses but did not overwrite the incoming request value in this configuration. An unauthenticated remote attacker could therefore spoof the trusted proxy identity and bypass authentication. This issue is fixed in Mailu 2024.06.55 and Mailu helm-charts 2.7.3.
    Severity
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-21 17:56 UTC
    CWE
    • CWE-290 - Authentication Bypass by Spoofing
    • CWE-807 - Reliance on Untrusted Inputs in a Security Decision
    Assigner
    References
    Impacted products
    Vendor Product Version
    Mailu Mailu Affected: >= 2.0.0, < 2024.06.55
    		Create a notification for this product.
    Mailu helm-charts Affected: < 2.7.3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-85751",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-21T17:56:04.999383Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-21T17:56:14.484Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Mailu",
          "vendor": "Mailu",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2024.06.55"
            }
          ]
        },
        {
          "product": "helm-charts",
          "vendor": "Mailu",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.7.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailu is a mail server distributed as a set of Docker images. From Mailu 2.0 until 2024.06.55 and prior to Mailu helm-charts 2.7.3, deployments with PROXY_AUTH_WHITELIST configured but REAL_IP_HEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The proxy_hide_header directive in the nginx template at core/nginx/conf/proxy.conf hid the header from upstream responses but did not overwrite the incoming request value in this configuration. An unauthenticated remote attacker could therefore spoof the trusted proxy identity and bypass authentication. This issue is fixed in Mailu 2024.06.55 and Mailu helm-charts 2.7.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
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        {
          "descriptions": [
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              "lang": "en",
              "type": "CWE"
            }
          ]
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          "descriptions": [
            {
              "cweId": "CWE-807",
              "description": "CWE-807: Reliance on Untrusted Inputs in a Security Decision",
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              "type": "CWE"
            }
          ]
        }
      ],
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        "dateUpdated": "2026-09-21T15:39:24.774Z",
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      },
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        {
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          ],
          "url": "https://github.com/Mailu/Mailu/security/advisories/GHSA-rfhj-4wcq-74xg"
        },
        {
          "name": "https://github.com/Mailu/Mailu/pull/4070",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Mailu/Mailu/pull/4070"
        },
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          "name": "https://github.com/Mailu/Mailu/pull/4071",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Mailu/Mailu/pull/4071"
        },
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        "discovery": "UNKNOWN"
      },
      "title": "Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
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    "dateReserved": "2026-09-04T14:50:16.721Z",
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    "state": "PUBLISHED"
  },
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}