TYPO3 CMS 14.2-14.3.5: Arbitrary MIME type upload
CVE-2026-15305 Published on July 14, 2026
TYPO3 CMS - Unrestricted File Upload in Form Framework
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.
Weakness Type
Insufficient Type Distinction
The software does not properly distinguish between different types of elements in a way that leads to insecure behavior.
Products Associated with CVE-2026-15305
Want to know whenever a new CVE is published for TYPO3? stack.watch will email you.
Affected Versions
TYPO3 CMS:- Version 14.2.0 and below 14.3.5 is affected.