Description
By exploiting the defVals parameter, attackers could bypass field‑level access checks during record creation in the TYPO3 backend. This gave them the ability to insert arbitrary data into prohibited exclude fields of a database table for which the user already has write permission for a reduced set of fields. This issue affects TYPO3 CMS versions 10.0.0-10.4.54, 11.0.0-11.5.48, 12.0.0-12.4.40, 13.0.0-13.4.22 and 14.0.0-14.0.1.
CVSS breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
Low
Availability (Vulnerable System)
None
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
None
Availability (Subsequent System)
None
Affected products
- TYPO3 / TYPO3 CMS10.0.0 – 10.4.55
- TYPO3 / TYPO3 CMS11.0.0 – 11.5.49
- TYPO3 / TYPO3 CMS12.0.0 – 12.4.41
- TYPO3 / TYPO3 CMS13.0.0 – 13.4.23
- TYPO3 / TYPO3 CMS14.0.0 – 14.0.2
References
- MISChttps://typo3.org/security/advisory/typo3-core-sa-2026-001
- PATCHhttps://github.com/TYPO3/typo3/commit/ac3f792bd5ab7c58153fc1075cb9e001c9cebe3b
- PATCHhttps://github.com/TYPO3/typo3/commit/fb98378a8fd30dd50d89a3d1a420780819f38232
- PATCHhttps://github.com/TYPO3/typo3/commit/cd11a19958d823d12d028f9345b41739c7e70118