WebCore on Apple Mac OS X 10.3.9 and 10.4.10 retains properties of certain global objects when a new URL is visited in the same window, which allows remote attackers to conduct cross-site scripting (XSS) attacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35743
http://www.vupen.com/english/advisories/2007/2732
http://www.securityfocus.com/bid/25159
http://securitytracker.com/id?1018494
http://secunia.com/advisories/26235
http://lists.apple.com/archives/security-announce//2007/Jul/msg00004.html