Incomplete blacklist vulnerability in MediaWiki before 1.4.11 does not properly remove certain CSS inputs (HTML inline style attributes) that are processed as active content by Internet Explorer, which allows remote attackers to conduct cross-site scripting (XSS) attacks.
http://www.securityfocus.com/bid/15024
http://www.novell.com/linux/security/advisories/2005_27_sr.html
http://sourceforge.net/project/shownotes.php?release_id=361505