Medium severityNVD Advisory· Published Jul 14, 2026· Updated Sep 3, 2026
CVE-2026-15305
CVE-2026-15305
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
typo3/cms-formPackagist | >= 14.2.0, < 14.3.5 | 14.3.5 |
Affected products
1Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-mfqj-cqv3-h7xwghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-15305ghsaADVISORY
- github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-form/CVE-2026-15305.yamlghsaWEB
- github.com/TYPO3/typo3/commit/817ad41cc9dd28aac0fc4d0fe16fc25d46dd554anvdWEB
- github.com/TYPO3/typo3/commit/cfda21050398eb145211a4fa6f9988f10e43e10bnvdWEB
- github.com/TYPO3/typo3/security/advisories/GHSA-mfqj-cqv3-h7xwghsaWEB
- news.typo3.com/security/advisory/typo3-core-sa-2026-020ghsaWEB
- typo3.org/security/advisory/typo3-core-sa-2026-020nvdWEB
News mentions
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