Developer Jonathan Levis just released an Jailbreak which works for iOS 11. It’s based on the tfp0-Exploit which is a bypass in Apple’s iOS 11 security system. The jailbreak is called “LiberiOS” and works on every 64-Bit OS including, iPad, iPhone X, iPhone 8 (Plus), iPhone 7 (Plus), iPhone 6(s) (Plus) and iPod Touch. There is also for Apple TV 4 and Apple TV 4K untill iOS 11.1.2 Jailbreak which you can get in the LiberTV forum.
How does it work?
To get LiberiOS working you need a special app, which must be installed on your device. The app called “Cydia Impactor” requires a (free) developer account from Apple, semi-untethered Jailbreak – which means you need to re-do all this each time you re-booted your iOS. A connection between your iOS and LiberiOSAPP is only needed once in a week.
What about 11.1.2?
Apple already fixed the hole in 11.1.2. If you’re already on this version then you’re out-of-luck a downgrade isn’t possible and there is (right now) no bypass for the latest iOS.