Somebody got too excited - this is a feature, not a flaw. Also, it's getting boring, these lock screen "hacks" that half the time are intentional behaviours. True hack would be accessing your phone remotely. If you at any point allow the "hacker" a physical access to your phone then you either shouldn't store all these TOP SECRET documents there, or change friends (because I assume most of these lock screen "hacks" are used for pranks - I can't imagine leaving my phone unattended outside my home)