An issue was discovered in certain Apple products. iOS before 11 is affected. Safari before 11 is affected. iCloud before 7.0 on Windows is affected. iTunes before 12.7 on Windows is affected. tvOS before 11 is affected. The issue involves the "WebKit" component. It allows remote attackers to bypass the Same Origin Policy and obtain sensitive cookie information via a custom URL scheme.
https://support.apple.com/HT208142
https://support.apple.com/HT208141
https://support.apple.com/HT208116
https://support.apple.com/HT208113
https://support.apple.com/HT208112
http://www.securitytracker.com/id/1039428