First "security update breaks file sharing"! That has
also been fixed. The easy way of knowing if you have the
second (and hopefully last) fix is to check the "build" number that is after the Version number. If your build number is
17B1002, Software Update should offer you the update again. The build number you want if
17B1003If you haven't updated High Sierra yet, please do so now.
This would be a great week to be on vacation at Apple... just be careful that you don't trip over the rolling heads when you return!