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 Events Manager Unspecified Vulnerability (5.5.5)
WordPress Plugin myLinksDump 'url' Parameter SQL Injection (1.2)
WordPress Plugin Token Manager 'tid' Parameter Multiple Cross-Site Scripting Vulnerabilities (1.0.2)
WordPress Plugin ByREV WP-PICShield Cross-Site Request Forgery (1.9.7)