Yet another teenager has uncovered a serious weakness in Apple technology. Just last week it emerged a 14-year-old uncovered a bug allowing snooping on iPhone and Mac users thanks to a problem in FaceTime. Now, German 18-year-old Linus Henze has uncovered a vulnerablity affecting the latest Apple macOS that leaves stored passwords open to malicious apps. That could include logins for your bank website, Amazon, Netflix, Slack and many more apps. And, even though this is a Mac-only bug, if you’re using the iCloud keychain, passwords synced across iPhones and Macs may also be in danger.