Vulnerability-Lookup

FKIE_CVE-2026-19418

Vulnerability from fkie_nvd - Published: 2026-08-11 08:17 - Updated: 2026-08-11 14:17

Severity

7.3 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

The referrer enforcement introduced with TYPO3-CORE-SA-2020-006 (CVE-2020-11069) became ineffective in TYPO3 v13.0, where TYPO3 CMS started serving the backend and Install Tool applications from the site's main entry script instead of the dedicated typo3/ directory. Whether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance's own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints. Attackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via Fetch/XHR with the privileges of an authenticated victim's user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.

References

	URL	Tags
	f4fb688c-4412-4426-b4b8-421ecf27b14a	https://github.com/TYPO3/typo3/commit/4a75e862c589c85d795d7c65dcdc835f8f413efc
	f4fb688c-4412-4426-b4b8-421ecf27b14a	https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7
	f4fb688c-4412-4426-b4b8-421ecf27b14a	https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872
	f4fb688c-4412-4426-b4b8-421ecf27b14a	https://typo3.org/security/advisory/typo3-core-sa-2020-006
	f4fb688c-4412-4426-b4b8-421ecf27b14a	https://typo3.org/security/advisory/typo3-core-sa-2026-021

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "modules": [
            "Backend",
            "Install"
          ],
          "packageName": "typo3/cms-backend",
          "product": "TYPO3 CMS",
          "repo": "https://github.com/TYPO3/typo3",
          "vendor": "TYPO3",
          "versions": [
            {
              "lessThan": "13.4.34",
              "status": "affected",
              "version": "13.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "14.3.6",
              "status": "affected",
              "version": "14.0.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "modules": [
            "Backend",
            "Install"
          ],
          "packageName": "typo3/cms-core",
          "product": "TYPO3 CMS",
          "repo": "https://github.com/TYPO3/typo3",
          "vendor": "TYPO3",
          "versions": [
            {
              "lessThan": "13.4.34",
              "status": "affected",
              "version": "13.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "14.3.6",
              "status": "affected",
              "version": "14.0.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "modules": [
            "Backend",
            "Install"
          ],
          "packageName": "typo3/cms-install",
          "product": "TYPO3 CMS",
          "repo": "https://github.com/TYPO3/typo3",
          "vendor": "TYPO3",
          "versions": [
            {
              "lessThan": "14.3.6",
              "status": "affected",
              "version": "14.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The referrer enforcement introduced with TYPO3-CORE-SA-2020-006 (CVE-2020-11069) became ineffective in TYPO3 v13.0, where TYPO3 CMS started serving the backend and Install Tool applications from the site\u0027s main entry script instead of the dedicated typo3/ directory.\n\nWhether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance\u0027s own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.\n\nAttackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via Fetch/XHR with the privileges of an authenticated victim\u0027s user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5."
    }
  ],
  "id": "CVE-2026-19418",
  "lastModified": "2026-08-11T14:17:13.277",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "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": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/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": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-19418",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-11T13:20:52.512047Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-11T08:17:20.533",
  "references": [
    {
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "url": "https://github.com/TYPO3/typo3/commit/4a75e862c589c85d795d7c65dcdc835f8f413efc"
    },
    {
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "url": "https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7"
    },
    {
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "url": "https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872"
    },
    {
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "url": "https://typo3.org/security/advisory/typo3-core-sa-2020-006"
    },
    {
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "url": "https://typo3.org/security/advisory/typo3-core-sa-2026-021"
    }
  ],
  "sourceIdentifier": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-346"
        },
        {
          "lang": "en",
          "value": "CWE-352"
        }
      ],
      "source": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
      "type": "Secondary"
    }
  ]
}

CVE-2026-19418 (GCVE-0-2026-19418)

Vulnerability from cvelistv5 – Published: 2026-08-11 07:29 – Updated: 2026-08-11 13:21

Title

TYPO3 CMS - Broken Access Control in Backend and Install Tool

Summary

Severity

7.3 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 13:20 UTC

CWE

CWE-346 - Origin Validation Error
CWE-352 - Cross-Site Request Forgery (CSRF)

Assigner

TYPO3

References

5 references

URL	Tags
https://typo3.org/security/advisory/typo3-core-sa…	vendor-advisory
https://typo3.org/security/advisory/typo3-core-sa…	related
https://github.com/TYPO3/typo3/commit/ae0abd329d5…	patch
https://github.com/TYPO3/typo3/commit/a0e8ee06a40…	patch
https://github.com/TYPO3/typo3/commit/4a75e862c58…	patch

Impacted products

2 products

Vendor	Product	Version
TYPO3	TYPO3 CMS	Affected: 13.0.0 , < 13.4.34 (semver) Affected: 14.0.0 , < 14.3.6 (semver)
TYPO3	TYPO3 CMS	Affected: 14.0.0 , < 14.3.6 (semver)

Credits

Hổ Cao Từ Benjamin Franzke

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-19418",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-11T13:20:52.512047Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-11T13:21:08.298Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "modules": [
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            },
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              "version": "14.0.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://packagist.org",
          "defaultStatus": "unaffected",
          "modules": [
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          ],
          "packageName": "typo3/cms-core",
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          "vendor": "TYPO3",
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          "versions": [
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              "status": "affected",
              "version": "14.0.0",
              "versionType": "semver"
            }
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      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "13.4.34",
                  "versionStartIncluding": "13.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "14.3.6",
                  "versionStartIncluding": "14.0.0",
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          "type": "reporter",
          "value": "H\u1ed5 Cao T\u1eeb"
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          "type": "remediation developer",
          "value": "Benjamin Franzke"
        }
      ],
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          "lang": "en",
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              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003e\u003cspan\u003eThe referrer enforcement introduced with TYPO3-CORE-SA-2020-006 (CVE-2020-11069) became ineffective in TYPO3 v13.0, where TYPO3 CMS started serving the backend and Install Tool applications from the site\u0027s main entry script instead of the dedicated \u003c/span\u003e\u003ccode\u003etypo3/\u003c/code\u003e\u003cspan\u003e directory.\u003c/span\u003e\u003c/div\u003e\u003cdiv\u003eWhether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance\u0027s own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.\u003c/div\u003e\u003cdiv\u003eAttackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via \u003ccode\u003eFetch\u003c/code\u003e/\u003ccode\u003eXHR\u003c/code\u003e with the privileges of an authenticated victim\u0027s user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.\u003c/div\u003e"
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          "tags": [
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        },
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          "tags": [
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          "url": "https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7"
        },
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          "name": "Git commit of 13.4 branch",
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      "source": {
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      "title": "TYPO3 CMS - Broken Access Control in Backend and Install Tool",
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  "cveMetadata": {
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    "assignerShortName": "TYPO3",
    "cveId": "CVE-2026-19418",
    "datePublished": "2026-08-11T07:29:37.478Z",
    "dateReserved": "2026-08-10T10:44:33.352Z",
    "dateUpdated": "2026-08-11T13:21:08.298Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

FKIE_CVE-2026-19418

CVE-2026-19418 (GCVE-0-2026-19418)

Tags

Sightings

Nomenclature