Apple now no longer allows downgrade from iOS 16.3. This comes together with the news that previous iOS releases were subject to exploit allowing to get user's location if that permission was not given to the application.
Apple did not disclose details of this exploit.
Maps
Available for: iPhone 8 and later, iPad Pro (all models), iPad Air 3rd generation and later, iPad 5th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to bypass Privacy preferences
Description: A logic issue was addressed with improved state management.
CVE-2023-23503: an anonymous researcher
About the security content of iOS 16.3 and iPadOS 16.3
Apple Support: About the security content of iOS 16.3 and iPadOS 16.3
References:
- Apple Stops Signing iOS 16.2 Following iOS 16.3 Launch, Downgrading No Longer Possible
- Was a Popular Brazilian Food Delivery App Bypassing Apple’s Location Privacy Settings on iOS?
- Apple Maps privacy bug may have allowed apps to collect location data without permission
- Was this Brazilian major app bypassing Apple's location privacy on iOS?
- Bypassing iOS 16.2 Location Privacy