WebKit in 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 enforce the HTTP Strict Transport Security (HSTS) protection mechanism for Content Security Policy (CSP) report requests, which allows man-in-the-middle attackers to obtain sensitive information by sniffing the network or spoof a report by modifying the client-server data stream.
https://support.apple.com/kb/HT205033
https://support.apple.com/kb/HT205030
http://www.securitytracker.com/id/1033274
http://www.securityfocus.com/bid/76341
http://lists.opensuse.org/opensuse-updates/2016-03/msg00054.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00000.html