An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. Safari before 10.1.1 is affected. tvOS before 10.2.1 is affected. The issue involves the "WebKit" component. It allows remote attackers to conduct Universal XSS (UXSS) attacks via a crafted web site that improperly interacts with frame loading.
https://support.apple.com/HT207804
https://support.apple.com/HT207801
https://support.apple.com/HT207798
https://security.gentoo.org/glsa/201706-15