This new Lockscreen bug is found by Dany Lisiansky. It will not expose your Email, Photos, Facebook and Twitter but allows attackers to access your phone call history, voicemails and entire list of contacts. Fixing this bug is pretty simple, disabling the Siri in Locks Screen is easy, disabling it there is a simple way to get around the phone app. An Iranian group defeated the iPhone Fingerprinting scanner Touch ID again, which allows them to unlock an iPhone with multiple Fingerprints.
Source: https://thehackernews.com/2013/09/another-iphone-lockscreen-bypass.html