Directory traversal vulnerability in MediaWiki 1.3.x before 1.3.11 and 1.4 beta before 1.4 rc1 allows remote attackers to delete arbitrary files or determine file existence via a parameter related to image deletion.
http://www.gentoo.org/security/en/glsa/glsa-200502-33.xml
http://sourceforge.net/project/shownotes.php?release_id=307067