Component Type: TYPO3 CMSSubcomponent: Session Handling (ext:backend)Release Date: May 20, 2025Vulnerability Type: Broken AuthenticationAffected Versions: 12.0.0-12.4.30, 13.0.0-13.4.11Severity: HighSuggested CVSS: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HReferences: CVE-2025-47941, CWE-288 Problem Description The multifactor authentication (MFA) dialog presented during backend login can be bypassed due to insufficient enforcement of access restrictions on all backend routes. Successful exploitation requires valid backend user credentials, as MFA can only be bypassed after successful authentication. Solution Update to TYPO3 versions 12.4.31 LTS, 13.4.12 LTS that fix the problem described. Credits Thanks to Jens Jacobsen and Y. Kahveci for reporting this issue, and to TYPO3 security team member Torben Hansen 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.