Launchpad.net

CVE 2008-5917

Cross-site scripting (XSS) vulnerability in the XSS filter (framework/Text_Filter/Filter/xss.php) in Horde Application Framework 3.2.2 and 3.3, when Internet Explorer is being used, allows remote attackers to inject arbitrary web script or HTML via unknown vectors related to style attributes.

See the CVE page on Mitre.org for more details.