Multiple cross-site scripting (XSS) vulnerabilities in Horde before 3.0.7 allow remote attackers to inject arbitrary web script or HTML via the (1) gzip/tar and (2) css MIME viewers, which do not filter or escape dangerous HTML when extracting and displaying attachments.
http://www.vupen.com/english/advisories/2005/2536
http://www.securityfocus.com/bid/15535
http://www.securityfocus.com/archive/1/417436/30/0/threaded
http://www.gentoo.org/security/en/glsa/glsa-200511-20.xml
http://www.debian.org/security/2005/dsa-909
http://secunia.com/advisories/17703