YouTube user EverythingApplesPro claims to have found a security vulnerability involving Apple’s iOS 8 Touch ID and Passcode. The process detailed in the video seems pretty simple but has a low success rate. In our testing, we were able to recreate the process with our own phones with Touch ID turned on. We’ve determined that this is almost definitely just Touch ID registering the thumbprint on a hair trigger. The reason it takes so many tries is that the phone appears to actually just be registering the home button press.”]
Source: https://gizmodo.com/ios-8-security-flaw-makes-it-possible-to-bypass-touch-i-1640152643