Critical HTC One Lockscreen Bypass
CORRECTION 1: It appears this bug exclusively pertains to the HTC One, rather than Android as a whole. Most likely something to do with the HTC Sense software.
UPDATE 1: A Reddit user seems to have confirmed that HTC have issued a fix. I’ve yet to update and test. If anyone wants to confirm, I’m on Twitter.
One can very easily bypass the HTC One lockscreen by swiping up from the bottom center of the screen during restart. You have a less than 500ms window in which to swipe up...