https://www.cnbc.com/2017/11/29/apple-rushes-to-resolve-huge-password-glitch-on-macos-high-sierra.html

Apple is scrambling to fix a serious glitch within its latest Mac operating system.

A major flaw in the way the MacOS High Sierra operates means that anyone can gain entry to a computer without the use of a password, obtaining access to powerful administrator rights in the process.