All you need to do is set a password for your root account (even if you never plan on using it), and no one will be able to use it to login to your Mac.
The bug was reported by Lemi Orhan Ergin who reached out to Apple over Twitter.
Choose Edit Change Root Password and enter a new, non-trivial password.
The level of unbridled access this security hole permits - and it abruptly being made public - will nearly certainly prompt Apple to move fast in releasing an update for its Mac operating system.
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If a bad actor exploited this security bug, they'd get System Administrator access - meaning that person could read and write over virtually any part of the computer system, including files in other macOS user accounts.
The MacOS High Sierra "root" login bug in action. The root account can also be used to log into the vulnerable machine remotely. That's all it takes to log in to a MacBook with High Sierra onboard. "It's probably a good time to confirm your firewall is up, and on stealth block".
Open System Preferences and click on the "Users & Groups" menu. After you click the lock icon, enter your admin name and password. Then select "Change Root Password..." and choose a strong password, something with many letters and characters that can't be guessed.
Despite suggestions that the flaw can be mitigated by disabling the computer's guest account, this will not work - it simply restarts the computer with Safari the only application running. Click "Login Options", then click "Join", which appears next to the text "Network Account Server". This is a level of access that is well in excess of a normal admin account that is created when adding users on a Mac.