WebKit in Apple Safari before 4.0.3 does not properly restrict the URL scheme of the pluginspage attribute of an EMBED element, which allows user-assisted remote attackers to launch arbitrary file: URLs and obtain sensitive information via a crafted HTML document.
http://www.vupen.com/english/advisories/2011/0212
http://www.securitytracker.com/id?1022720
http://www.securityfocus.com/bid/36024
http://support.apple.com/kb/HT3733
http://secunia.com/advisories/43068
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
http://lists.apple.com/archives/security-announce/2009/Aug/msg00002.html