Medium 6.3Published Jul 14, 2026

CVE-2026-15305TYPO3 CMS - Unrestricted File Upload in Form Framework

Updated under an hour ago (Oct 28, 2026, 3:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v4.0, CNA)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
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: TYPO3
NVD analysis: Deferred
Record last updated: Jul 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

TYPO3 TYPO3 CMS typo3:cms (from the name)	from 14.2.0 before 14.3.5	CNA record

References

References

https://typo3.org/security/advisory/typo3-core-sa-2026-020	vendor-advisory
https://github.com/TYPO3/typo3/commit/817ad41cc9dd28aac0fc4d0fe16fc25d46dd554a	patch
https://github.com/TYPO3/typo3/commit/cfda21050398eb145211a4fa6f9988f10e43e10b	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.