Description
Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restriction. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.
Problem types
CWE-178 Improper Handling of Case Sensitivity
Product status
Any version before 10.4.57
11.0.0 (semver) before 11.5.51
12.0.0 (semver) before 12.4.46
13.0.0 (semver) before 13.4.31
14.0.0 (semver) before 14.3.3
Credits
Alexander Künzl
Oliver Hader
Benjamin Franzke
References
typo3.org/security/advisory/typo3-core-sa-2026-008
github.com/...ommit/2030617e6f273cee7b756c695f0a48a45a31eb47 (Git commit of main branch)
github.com/...ommit/eb2b2251d90339d3ab55df3d4c0378ae0c780b45 (Git commit of 13.4 branch)