Cross-site scripting (XSS) vulnerability in Help Viewer in Apple Mac OS X 10.6 before 10.6.4 allows remote attackers to inject arbitrary web script or HTML via a crafted help: URL, related to "URL parameters in HTML content."
http://lists.apple.com/archives/security-announce/2010//Jun/msg00001.html
http://secunia.com/advisories/40220
http://securitytracker.com/id?1024103
http://support.apple.com/kb/HT4188