A hacker has found a new and quite simple method of bypassing the security of a locked iOS device (iPhone, iPad or iPod touch) running Apple’s latest iOS 9 operating system that could allow you to access the device’s photos and contacts in 30 seconds or less. The method is possible to bypass using the benevolent nature of Apple’s personal assistant Siri. Until Apple fixes this issue, iOS users can protect themselves by disabling Siri on the lock screen from Settings > Touch ID & Passcode.
Source: https://thehackernews.com/2015/09/io9-hack-passcode.html