UIFileSharingEnabled exposes the app's Documents directory over USB / Finder.
How it's exploited
UIFileSharingEnabled exposes the app's Documents directory in Finder/iTunes. Anyone with the unlocked device on a computer browses and copies whatever the app stored there.
Why it matters
Files assumed private (exports, caches, databases placed in Documents) are user-visible and trivially extracted.
How to fix it
Disable file sharing unless the feature is deliberate.
Keep sensitive files out of Documents; use Application Support with NSFileProtectionComplete and the Keychain for secrets.