TYPO3-CORE-SA-2026-017: Privilege Escalation & SQL Injection in Form Framework
It has been discovered that TYPO3 CMS is susceptible to broken access control.
- Component Type: TYPO3 CMS
- Subcomponent: Form Framework (ext:form)
- Release Date: June 9, 2026
- Vulnerability Type: Privilege Escalation & SQL Injection
- Affected Versions: 14.0.0-14.3.2
- Severity: High
- Suggested CVSS: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- References: CVE-2026-49741, CWE-89, CWE-862
Problem Description
Backend users with write access to the form_definition database table were able to directly create, update, or delete form definition records via DataHandler, bypassing the Form Framework's persistence validation and permission checks. This allowed injecting arbitrary form configurations, re-enabling attack vectors originally addressed in TYPO3-CORE-SA-2018-003, including SQL injection and privilege escalation.
Solution
Update to TYPO3 version 14.3.3 LTS that fixes the problem described.
Credits
Thanks to Selçuk Güney for reporting this issue, and to TYPO3 core & security team member Oliver Hader 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
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