Advisory details:
github_osv / GHSA-mfqj-cqv3-h7xw
| Advisory ID | github_osv/GHSA-mfqj-cqv3-h7xw |
| Aliases |
CVE-2026-15305
|
| Summary | TYPO3 CMS - Unrestricted File Upload in Form Framework ### 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 5.7 |
| Risk | 2.9 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| CWE-351 | Insufficient Type Distinction |
| System | Score | Found at |
|---|---|---|
| cvssv4 | 6.3 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-mfqj-cqv3-h7xw/GHSA-mfqj-cqv3-h7xw.json |
| generic_textual | MODERATE |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-form/CVE-2026-15305.yaml | ||
| https://github.com/TYPO3/typo3 | ||
| https://github.com/TYPO3/typo3/security/advisories/GHSA-mfqj-cqv3-h7xw | ||
| https://news.typo3.com/security/advisory/typo3-core-sa-2026-020 | ||
| 817ad41cc9dd28aac0fc4d0fe16fc25d46dd554a | Other | https://github.com/TYPO3/typo3/commit/817ad41cc9dd28aac0fc4d0fe16fc25d46dd554a |
| cfda21050398eb145211a4fa6f9988f10e43e10b | Other | https://github.com/TYPO3/typo3/commit/cfda21050398eb145211a4fa6f9988f10e43e10b |
| CVE-2026-15305 | https://nvd.nist.gov/vuln/detail/CVE-2026-15305 | |
| typo3-core-sa-2026-020 | Advisory | https://typo3.org/security/advisory/typo3-core-sa-2026-020 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
There are no SSVC decisions available.