TYPO3-CORE-SA-2026-007: Broken Access Control in File Abstraction Layer

• Component Type: TYPO3 CMS
• Subcomponent: File Abstraction Layer (ext:core)
• Release Date: June 9, 2026
• Vulnerability Type: Broken Access Control
• Affected Versions: 10.0.0-10.4.56, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30, 14.0.0-14.3.2
• Severity: High
• Suggested CVSS: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
• References: CVE-2026-47343, CWE-862

Problem Description

Non-privileged backend users with file mount access were able to perform write operations (move, delete, rename) on folders representing the root of an active file mount due to missing authorization restrictions.

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

Thanks to Arne Uplegger for reporting this issue, and to TYPO3 security team member Elias Häußler 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.