A logic issue existed in the handling of synchronous page loads. This issue was addressed with improved state management. This issue is fixed in iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, Safari 12.1.2, iTunes for Windows 12.9.6, iCloud for Windows 7.13, iCloud for Windows 10.6. Processing maliciously crafted web content may lead to universal cross site scripting.
https://support.apple.com/HT210358
https://support.apple.com/HT210357
https://support.apple.com/HT210356
https://support.apple.com/HT210355
https://support.apple.com/HT210351