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.
References (4)
Core 4
Core References
Vendor Advisory vendor-advisory
https://typo3.org/security/advisory/typo3-core-sa-2026-001
Scores
CVSS v3
6.5
EPSS
0.0001
EPSS Percentile
1.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-863
Status
published
Products (2)
typo3/cms-backend
14.0.0 - 14.0.2Packagist
typo3/typo3
10.0.0 - 10.4.55
Published
Jan 13, 2026
Tracked Since
Feb 18, 2026