Apple Safari before 6.2.5, 7.x before 7.1.5, and 8.x before 8.0.5, as used on iOS before 8.3 and other platforms, does not properly delete browsing-history data from the history.plist file, which allows attackers to obtain sensitive information by reading this file.
https://support.apple.com/HT204661
https://support.apple.com/HT204658
http://www.securitytracker.com/id/1032047
http://lists.apple.com/archives/security-announce/2015/Apr/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Apr/msg00000.html