MediaWiki 1.11, and other versions before 1.13.3, does not properly protect against the download of backups of deleted images, which might allow remote attackers to obtain sensitive information via requests for files in images/deleted/.
https://www.redhat.com/archives/fedora-package-announce/2008-December/msg01309.html
https://www.redhat.com/archives/fedora-package-announce/2008-December/msg01256.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/47678
http://secunia.com/advisories/33349
http://lists.wikimedia.org/pipermail/mediawiki-announce/2008-December/000080.html