The AutoFill feature in Apple Safari before 5.0.1 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1.1 on Mac OS X 10.4, allows remote attackers to obtain sensitive Address Book Card information via JavaScript code that forces keystroke events for input fields.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11112
http://www.securityfocus.com/bid/42020
http://support.apple.com/kb/HT4276
http://lists.apple.com/archives/security-announce/2010//Jul/msg00001.html