ikiwiki before 3.20110328 does not ascertain whether the htmlscrubber plugin is enabled during processing of the "meta stylesheet" directive, which allows remote authenticated users to conduct cross-site scripting (XSS) attacks via crafted Cascading Style Sheets (CSS) token sequences in (1) the default stylesheet or (2) an alternate stylesheet.
http://www.vupen.com/english/advisories/2011/1005
http://www.vupen.com/english/advisories/2011/0907
http://www.securityfocus.com/bid/47285
http://www.debian.org/security/2011/dsa-2214
http://secunia.com/advisories/44137
http://secunia.com/advisories/44079
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058403.html