GHSA-mfqj-cqv3-h7xw

Suggest an improvement
Source
https://github.com/advisories/GHSA-mfqj-cqv3-h7xw
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-mfqj-cqv3-h7xw/GHSA-mfqj-cqv3-h7xw.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-mfqj-cqv3-h7xw
Aliases
Published
2026-08-31T19:53:59Z
Modified
2026-08-31T20:25:45Z
Severity
  • 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
TYPO3 CMS - Unrestricted File Upload in Form Framework
Details

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.

Database specific 
{
    "cwe_ids":  [
        "CWE-351"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-31T19:53:59Z",
    "nvd_published_at":  null,
    "severity":  "MODERATE"
}
References

Affected packages

Packagist / typo3/cms-form

Package

Name
typo3/cms-form
Purl
pkg:composer/typo3/cms-form

Affected ranges

Type
ECOSYSTEM
Events
Introduced
14.2.0
Fixed
14.3.5

Affected versions

v14.*
v14.2.0
v14.3.0
v14.3.1
v14.3.2
v14.3.3
v14.3.4

Database specific

last_known_affected_version_range 
"<= 14.3.4"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-mfqj-cqv3-h7xw/GHSA-mfqj-cqv3-h7xw.json"