A logic issue was addressed with improved state management. This issue is fixed in iOS 13.6 and iPadOS 13.6, tvOS 13.4.8, watchOS 6.2.8, Safari 13.1.2, iTunes 12.10.8 for Windows, iCloud for Windows 11.3, iCloud for Windows 7.20. Processing maliciously crafted web content may lead to universal cross site scripting.
https://support.apple.com/HT211295
https://support.apple.com/HT211294
https://support.apple.com/HT211293
https://support.apple.com/HT211292
https://support.apple.com/HT211291