Description
MediaWiki version older than 1.22.2, 1.21.5 and 1.19.11 are affected by a remote code execution vulnerability if file upload support for DjVu is enabled (natively supported by MediaWiki) or PDF file upload support is enabled (in combination with the PdfHandler extension). Neither file type is enabled by default in MediaWiki installations. If you are affected, we strongly urge you to update immediately.
Remediation
Update to the latest version of MediaWiki.
References
Related Vulnerabilities
WordPress Plugin VideoWhisper Video Presentation 'vw_upload.php' Arbitrary File Upload (3.17)
WordPress Plugin WP Database Backup Cross-Site Scripting (3.3)
OpenSSL NULL Pointer Dereference Vulnerability (CVE-2023-0216)
MySQL Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2020-2922)