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certfr-2026-avi-1036 — De multiples vulnérabilités ont été découvertes dans Typo3. Elles permettent à un attaquant de provoquer un contourneme…

certfr-2026-avi-1036

fkie_cve-2026-15305

Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured. 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. This issue affects TYPO3 CMS versions 14.2.0-14.3.4.

GHSA-mfqj-cqv3-h7xw — TYPO3 CMS - Unrestricted File Upload in Form Framework

Affected: Packagist: typo3/cms-form

### 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.