CVE-2025-47939: TYPO3 CMS Vulnerable to Unrestricted File Upload in File Abstraction Layer

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-20 · updated 2026-06-17
Weakness: CWE-351

Description

TYPO3 is an open source, PHP based web content management system. By design, the file management module in TYPO3’s backend user interface has historically allowed the upload of any file type, with the exception of those that are directly executable in a web server context. This lack of restriction means it is possible to upload files that may be considered potentially harmful, such as executable binaries (e.g., `.exe` files), or files with inconsistent file extensions and MIME types (for example, a file incorrectly named with a `.png` extension but actually carrying the MIME type `application/zip`) starting in version 9.0.0 and prior to versions 9.5.51 ELTS, 10.4.50 ELTS, 11.5.44 ELTS, 12.4.31 LTS, and 13.4.12 LTS. Although such files are not directly executable through the web server, their presence can introduce indirect risks. For example, third-party services such as antivirus scanners or malware detection systems might flag or block access to the website for end users if suspicious files are found. This could negatively affect the availability or reputation of the site. Users should update to TYPO3 version 9.5.51 ELTS, 10.4.50 ELTS, 11.5.44 ELTS, 12.4.31 LTS, or 13.4.12 LTS to fix the problem.

Affected products

typo3: from 9.0.0 before 9.5.51; from 10.0.0 before 10.4.50; from 11.0.0 before 11.5.44; from 12.0.0 before 12.4.31; from 13.0.0 before 13.4.12 — fixed in 10.4.50, 11.5.44, 12.4.31, 13.4.12, 9.5.51

How to fix

Upgrade to a fixed version: typo3 10.4.50, 11.5.44, 12.4.31, 13.4.12. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2025-47939 or the next vulnerability affects your stack