Wow, this is a bad one. On Macs running the latest version of High Sierra (10.13.1 (17B48)), it appears that anyone can log in just by putting “root” in the user name field in a certain place. This is a huge, huge problem. Apple will fix it probably within hours but holy moly. Do not leave your Mac unattended until this is resolved. Read More...
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Huge security flaw lets anyone log into a High Sierra Mac
techcrunch.com