Apple T2 Security Chip Has Unfixable Flaw

Intel Macs that use Apple's T2 Security Chip are vulnerable to an exploit that could allow a hacker to circumvent disk encryption, firmware passwords and the whole T2 security verification chain, according to team of software jailbreakers.... 

On the plus side, however, it also means the vulnerability isn't persistent, so it requires a "hardware insert or other attached component such as a malicious USB-C cable" to work. more 

Malicious USB cables are the latest, and arguably the most insidious, threats on the corporate information security landscape. Every USB cable on premises, and those being used elsewhere by employees, needs to be vetted for authenticity. Security directors are enlisting the aid of technical counterespionage consultants to perform this task.