GHSA-4f2f-jr2m-j7p4
Suggest an improvement- Source
- https://github.com/advisories/GHSA-4f2f-jr2m-j7p4
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-4f2f-jr2m-j7p4/GHSA-4f2f-jr2m-j7p4.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-4f2f-jr2m-j7p4
- Withdrawn
- 2026-09-01T21:30:52Z
- Published
- 2026-08-11T09:32:33Z
- Modified
- 2026-09-01T21:45:23Z
- Severity
-
- 7.3 (High) CVSS_V4 - 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 CVSS Calculator
- Summary
- Duplicate Advisory: TYPO3-CORE-SA-2026-021: Broken Access Control in Backend and Install Tool
- Details
-
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-68jx-f42c-7599. This link is maintained to preserve external references.
Original Description
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.
- Database specific
{ "cwe_ids": [ "CWE-346" ], "github_reviewed": true, "github_reviewed_at": "2026-09-01T21:30:52Z", "nvd_published_at": "2026-08-11T08:17:20Z", "severity": "HIGH" }- References
-
- https://nvd.nist.gov/vuln/detail/CVE-2026-19418
- https://github.com/TYPO3/typo3/commit/4a75e862c589c85d795d7c65dcdc835f8f413efc
- https://github.com/TYPO3/typo3/commit/a0e8ee06a40e959b9e7b06a4b1cb19d3a0d3dcf7
- https://github.com/TYPO3/typo3/commit/ae0abd329d52285fe6e92804c3608820ad45e872
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-19418.yaml
- https://news.typo3.com/security/advisory/typo3-core-sa-2026-021
- https://typo3.org/security/advisory/typo3-core-sa-2020-006
- https://typo3.org/security/advisory/typo3-core-sa-2026-021
Affected packages
Packagist / typo3/cms-core
Package
- Name
- typo3/cms-core
- Purl
- pkg:composer/typo3/cms-core
Affected versions
v13.*
Packagist / typo3/cms-core
Package
- Name
- typo3/cms-core
- Purl
- pkg:composer/typo3/cms-core