Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-p8pr-442q-qf8g
Advisory ID github_osv/GHSA-p8pr-442q-qf8g
Aliases
Summary Duplicate Advisory: TYPO3-CORE-SA-2026-020: TYPO3 CMS - Unrestricted File Upload in Form Framework ## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-mfqj-cqv3-h7xw. This link is maintained to preserve external references. ## Original 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 14.2.0-14.3.5.
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
Weaknesses (1)
CWE-351 Insufficient Type Distinction
System Score Found at
cvssv4 6.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-p8pr-442q-qf8g/GHSA-p8pr-442q-qf8g.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://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 exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-p8pr-442q-qf8g/GHSA-p8pr-442q-qf8g.json
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.