This issue was addressed by restricting options offered on a locked device. This issue is fixed in iOS 16.4 and iPadOS 16.4. A person with physical access to an iOS device may be able to view the last image used in Magnifier from the lock screen.
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
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https://support.apple.com/en-us/HT213676 | release notes vendor advisory |