Directory traversal vulnerability in Apple Safari before 5.1.1 allows remote attackers to execute arbitrary JavaScript code, in a Safari Extensions context, via a crafted safari-extension: URL.
https://exchange.xforce.ibmcloud.com/vulnerabilities/70566
http://support.apple.com/kb/HT5000
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00004.html