Cross-site scripting (XSS) vulnerability in MediaWiki before 1.18.5 and 1.19.x before 1.19.2 allows remote attackers to inject arbitrary web script or HTML via a File: link to a nonexistent image.
https://phabricator.wikimedia.org/T41700
https://lists.wikimedia.org/pipermail/mediawiki-announce/2012-August/000119.html
https://bugzilla.redhat.com/show_bug.cgi?id=853409
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686330