MediaWiki before 1.23.11, 1.24.x before 1.24.4, and 1.25.x before 1.25.3 uses the thumbnail ImageMagick command line argument, which allows remote attackers to obtain the installation path by reading the metadata of a PNG thumbnail file.

MediaWiki before 1.23.11, 1.24.x before 1.24.4, and 1.25.x before 1.25.3 does not throttle file uploads, which allows remote authenticated users to have unspecified impact via multiple file uploads.