A permissions issue was addressed with additional restrictions. This issue is fixed in iOS 18.3 and iPadOS 18.3, macOS Sequoia 15.3, tvOS 18.3, visionOS 2.3, watchOS 11.3. An app may be able to modify protected parts of the file system.
https://support.apple.com/en-us/122073
https://support.apple.com/en-us/122072
https://support.apple.com/en-us/122071