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Re:macOS High Sierra: Anyone can login as “root” with empty ... by hellofunk on Wednesday November 29, 2017 @11:20AM (#15807958)
> this particular bug happened precisely because Apple has changed _something_ in macOS

I don't know much about this bug but I have seen several reports that the bug has actually existed quite some time and is not new, only the publicity surrounding it is now shining a bright light on it.

Re:macOS High Sierra: Anyone can login as “root” with empty ... by yoz-y on Wednesday November 29, 2017 @11:26AM (#15808022)
I thought it was confirmed that it is new to High Sierra, it was indeed lingering on forums as a "administrator hint" though.
Re:macOS High Sierra: Anyone can login as “root” with empty ... by hellofunk on Wednesday November 29, 2017 @12:09PM (#15808541)
I think you are right, but it's still been in the wild for several months, despite that Apple just realized a comment claiming they discovered the problem yesterday.