It is always possible that someone found the problem through sheer weight in numbers.
Only if these "numbers" were all testers. Consider:
1) Most people would only do the "expected thing", thus not proceeded into fresh, wild areas of the state space
2) Most people wouldn't know what they were looking at if a problem occurred, neither would they detect that it is a security problem
3) Most people upon encountering a problem would just say "DUH" and click on the back button, maybe reboot the PC
4) Most people wouldn't even bother to tell anyone about IT weirdness
This leaves people who know about IT, perform new operations, know what they are looking at with enough time on their hands (or are foolish enough, considering how these things may pan out) to tell somebody.