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Medium

TYPO3 CMS - Unrestricted File Upload in Form Framework

  • Disclosed: 31.08.2026
  • Updated: 11.10.2026 10:22

Problem

Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured - uploading PHP files was not possible. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline.

Solution

Update to TYPO3 version 14.3.5 LTS that fixes the problem described.

Credits

Thanks to Sébastien Convers for reporting this issue, and to Josua Vogel and Oliver Hader for fixing it.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package typo3/cms-form >= 14.2.0, < 14.3.5 14.3.5

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness (CWE)
CWE-351
Platform
Composer
Package
typo3/cms-form
Disclosed
31.08.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-mfqj-cqv3-h7xw - 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

  1. TYPO3 CMS - Unrestricted File Upload in Form Framework this entry
    Medium CVE-2026-15305 >= 14.2.0, < 14.3.5 14.3.5
  2. TYPO3 CMS has Broken Access Control in its Form Framework
    High CVE-2026-11607 < 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
  3. TYPO3 CMS has Privilege Escalation & SQL Injection in its Form Framework
    High CVE-2026-49741 >= 14.0.0, < 14.3.3 14.3.3
  4. TYPO3 CMS has Broken Access Control in its Form Framework
    High CVE-2026-47346 < 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
  5. TYPO3 Form Framework Module vulnerable to Cross-Site Request Forgery
    Medium · 5.4 CVE-2024-55922 >= 10.0.0, < 10.4.48, >= 11.0.0, < 11.5.42, >= 12.0.0, < 12.4.25, >= 13.0.0, < 13.4.3 10.4.48, 11.5.42, 12.4.25, 13.4.3
  6. Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in typo3/cms-form
    Medium · 5.4 CVE-2021-21358 >= 10.2.0, < 10.4.14, >= 11.0.0, < 11.1.1 10.4.14, 11.1.1
  7. Broken Access Control in Form Framework
    High · 8.3 CVE-2021-21357 >= 8.0.0, < 8.7.40, >= 9.0.0, < 9.5.25, >= 10.0.0, < 10.4.14, >= 11.0.0, < 11.1.1 8.7.40, 9.5.25, 10.4.14, 11.1.1
  8. Unrestricted File Upload in Form Framework
    High · 8.6 CVE-2021-21355 >= 8.0.0, < 8.7.40, >= 9.0.0, < 9.5.25, >= 10.0.0, < 10.4.14, >= 11.0.0, < 11.1.1 8.7.40, 9.5.25, 10.4.14, 11.1.1

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