TYPO3-CORE-SA-2025-016: Privilege Escalation to System Maintainer

Categories: Development, TYPO3 CMS Created by Oliver Hader
It has been discovered that TYPO3 CMS is susceptible to broken authentication.


Problem Description

Administrator-level backend users without system maintainer privileges can escalate their privileges and gain system maintainer access. Exploiting this vulnerability requires a valid administrator account.

Solution

Update to TYPO3 versions 10.4.50 ELTS, 11.5.44 ELTS, 12.4.31 LTS, 13.4.12 LTS that fix the problem described.

Credits

Thanks to Alexander Künzl for reporting this issue, and to TYPO3 core & security team member Oliver Hader for fixing it.

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.

General Note

All security-related code changes are tagged so you can easily look them up in our review system.