Apple Safari before 6.2.8, 7.x before 7.1.8, and 8.x before 8.0.8, as used in iOS before 8.4.1 and other products, does not indicate what web site originated an input prompt, which allows remote attackers to conduct spoofing attacks via a crafted site.
https://support.apple.com/kb/HT205033
https://support.apple.com/kb/HT205030
http://www.securitytracker.com/id/1033274
http://www.securityfocus.com/bid/76342
http://lists.apple.com/archives/security-announce/2015/Aug/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00000.html