A few days ago Apple sent out security update 2017-001 to users of Mac OS High Sierra, due to a particularly serious bug regarding password management.
It is now announced that there are still a large number of Users who have problems with the password bug. The common denominator is that the victims have updated to 10.13.1 first after that they have installed the security update.
The solution in this case is to reinstall Security Update 2017-001, but additionally the computer must be restarted after completion of installation. Otherwise, there is still a risk of unauthorized access to the contents of your computer.
– The big question right now is what Apple's Mac team really is dealing with. I do not know what happens that these bugs are slipping through quality assurance, "said security researcher Thomas Reed in a comment to Wired.
In this context, it is mentioned that not only is Mac OS High Sierra affected by serious bugs lately. Even iOS 11 has had a lot of problems, which led to an emergency update being sent out on Saturday.