Safari in Apple iOS before 4 on the iPhone and iPod touch does not properly implement the Accept Cookies preference, which makes it easier for remote web servers to track users via a cookie.
https://exchange.xforce.ibmcloud.com/vulnerabilities/59634
http://www.securityfocus.com/bid/41016
http://support.apple.com/kb/HT4225
http://lists.apple.com/archives/security-announce/2010/Jun/msg00003.html