TYPO3 CMS has Broken Access Control in its Form Framework
Problem
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.
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
TYPO3 CMS thanks Alexander Künzl for reporting this issue, and to TYPO3 core & security team members Oliver Hader and Benjamin Franzke for fixing it.
Resources
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | typo3/cms-core | < 10.4.57, >= 11.0.0, < 11.5.51, >= 12.0.0, < 12.4.46, >= 13.0.0, < 13.4.31, >= 14.0.0, < 14.3.3 | 10.4.57, 11.5.51, 12.4.46, 13.4.31, 14.3.3 |
| Composer package | typo3/cms-form | < 10.4.57, >= 11.0.0, < 11.5.51, >= 12.0.0, < 12.4.46, >= 13.0.0, < 13.4.31, >= 14.0.0, < 14.3.3 | 10.4.57, 11.5.51, 12.4.46, 13.4.31, 14.3.3 |
References
- https://github.com/TYPO3/typo3/security/advisories/GHSA-hwvq-2w67-rvxp
- https://nvd.nist.gov/vuln/detail/CVE-2026-47346
- https://github.com/TYPO3/typo3/commit/2030617e6f273cee7b756c695f0a48a45a31eb47
- https://github.com/TYPO3/typo3/commit/eb2b2251d90339d3ab55df3d4c0378ae0c780b45
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2026-47346.yaml
- https://github.com/TYPO3/typo3
- https://typo3.org/security/advisory/typo3-core-sa-2026-008
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-178, CWE-862- Platform
- Composer
- Package
typo3/cms-core, typo3/cms-form- Disclosed
- 12.06.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hwvq-2w67-rvxp - CC BY 4.0
Vulnerability history: typo3/cms-form
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 03.2021 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 3
Disclosures per year
- 2021: 3
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 4
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TYPO3 CMS has Broken Access Control in its Form Framework this entry
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