Java on Apple Mac OS X 10.5.4 and 10.5.5 does not prevent applets from accessing file:// URLs, which allows remote attackers to execute arbitrary programs.
https://exchange.xforce.ibmcloud.com/vulnerabilities/45397
http://www.securitytracker.com/id?1020944
http://www.securityfocus.com/bid/31380
http://support.apple.com/kb/HT3179
http://secunia.com/advisories/32018
http://lists.apple.com/archives/security-announce//2008/Sep/msg00007.html