How iOS can warn you when one of your passwords shows up in a data leak

A new iPhone warning can tell you when a saved password appears in a data leak—but it doesn’t automatically mean your account was hacked. In iOS, Apple’s Passwords app compares credentials stored in the app against leaked-password data. If a match is found, the iPhone flags the login for review inside the Passwords app, where you can see whether it’s marked as leaked, reused, or weak. Apple says it uses privacy-preserving checks for non-matching passwords, sending derived information to its servers rather than the password itself. The alert doesn’t reveal where the leak occurred.