iOS 11.2.1 is recently released for the iPhones. According to a recent report, the iPhone X running this version of iOS has apparently been jailbroken.
The news comes in a report from security researchers at Chinese company Alibaba who are claiming that they have managed to jailbreak the handset running the most recent iOS 11.2.1 software. The company has said that this new jailbreak is different from recent jailbreaks but does not explain exactly how it differs.
Although iOS 11.2 fixes some security issues, we confirmed the new iOS will still be jailbroken on the first day it was released. Although we escaped iOS 11.2 quickly, we were limited to security research purposes, our team won’t provide any jailbreak tool.
Source Pandora Labs