Help Viewer in Apple Mac OS X 10.4.11 and 10.5.2 allows remote attackers to execute arbitrary Applescript via a help:topic_list URL that injects HTML or JavaScript into a topic list page, as demonstrated using a help:runscript link.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41295
http://www.vupen.com/english/advisories/2008/0924/references
http://www.us-cert.gov/cas/techalerts/TA08-079A.html
http://www.securitytracker.com/id?1019657
http://www.securityfocus.com/bid/28371
http://www.securityfocus.com/bid/28304
http://secunia.com/advisories/29420
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html