An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. The issue involves the "WebKit" component. It allows remote attackers to overwrite cookies via a crafted web site.
https://usn.ubuntu.com/3687-1/
https://support.apple.com/HT208854
https://support.apple.com/HT208853
https://support.apple.com/HT208852
https://support.apple.com/HT208850
https://support.apple.com/HT208848