Apple accidentally re-introduced a vulnerability in its latest operating system, iOS 12.4, that had been previously fixed. The flaw allows phones to be jailbroken and a public jailbreak has just been released to take advantage of it on phones running the latest version of iOS. The blunder means that Apple devices that are fully updated to the most recent iOS version are open to a vulnerability that had previously been patched in May. Apple has not responded to a request for comment from the company.
Source: https://threatpost.com/apple-ios-patch-blunder-iphones-jailbreaks/147519/