TYPO3 CMS has Broken Access Control in its Form Framework
### Problem Backend users with access to the Form Framework were able to use files not ending in `.form.yaml` as form definitions, which were processed without denying the incorrect file extension. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts. ### Solution Update to TYPO3 versions 10.4.57 ELTS, 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described. ### Credits TYPO3 CMS thanks “Ethan” for reporting this issue, and TYPO3 core & security team member Oliver Hader for fixing it. ### Resources * [TYPO3-CORE-SA-2026-019](https://typo3.org/security/advisory/typo3-core-sa-2026-019)
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-11607US | —OT elevated | — | ||
Backend users with access to the Form Framework were able to use files not ending in .form.yaml as form definitions, which were processed without denying the incorrect file extensi… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-11607.yamlWEB
- https://github.com/TYPO3/typo3PACKAGE
- https://github.com/TYPO3/typo3/commit/040d50d082a01f9e8bd113effd91290a9bb3b69eWEB
- https://github.com/TYPO3/typo3/commit/50974c658f647f1aece347b5d6d5acc3c87f2dcaWEB
- https://github.com/TYPO3/typo3/security/advisories/GHSA-pjpj-v387-x4vqWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-11607ADVISORY
- https://typo3.org/security/advisory/typo3-core-sa-2026-019WEB
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