The issue was addressed with improved UI. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. Visiting a website that frames malicious content may lead to UI spoofing.
https://support.apple.com/en-us/128073
https://support.apple.com/en-us/128070
https://support.apple.com/en-us/128069
https://support.apple.com/en-us/128068