TYPO3-CORE-SA-2025-019: Insufficient Entropy in Password Generation

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


Problem Description

By default, the Password Generation component creates a password that always begins with a deterministic three‑character prefix (lower‑case, upper‑case, digit). Consequently, the effective entropy of the generated passwords is lower than expected. Invocations that employ the random password rules are unaffected.

Solution

Update to TYPO3 versions 12.4.37 LTS, 13.4.18 LTS that fix the problem described.

Credits

Thanks to Mathias Brodala 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.