Mac OSX Root Hack
Mac OS High Sierra 10.13.1 Has A Major Security Bug You Need To Fix Now (a patch is now available)!
Here's what has been discovered in the 10.13.1 High Sierra OS:
A person who has physical access to your Mac running OSX 10.13.1 may be able to bypass security credentials by entering the username 'root' and clicking unlock with no password. It may take several attempts, but eventually, access will be granted. From there, this person will have access to change all settings and logins on your Mac, potentially accessing all of your data and passwords and even completely locking you out of your own account.
Here's an article with more details from USA Today.
Steps You Can Take Immediately To Protect Yourself:
Check to see if you're running OSX 10.13.1 by clicking the Apple icon in the upper left corner of your screen.
Select 'About This Mac'
Look for Version Number
If Version is 10.13.1, update your Mac with the available security patch (pictured left).
Click 'Software Update'. This will automatically open the App Store which will offer you the available security patch automatically.
Click the 'Update All' button.