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So it requires physical access to a Mac that's not just "unlocked" but that has the Users dialogue open with the padlock showing that the pane is unlocked as well. So, no risk if no one else has physical access to the machine or those that do don't know the password. Not exactly like anyone can log in with root, requiring no unlocking at all. So, a bug? Yes. A catastrophic and highly embarrassing failure? Not really.
 
I tried it and it did not work for me, but, then I tried it again and it did. This is a very serious bug, Apple should address this asap!!
 
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Worked first try, only works in Users & Groups.

Also, I swear I heard a mechanical click from the computer.

Edit: The sounds was the new SFX for unlocking.
 

So it requires physical access to a Mac that's not just "unlocked" but that has the Users dialogue open with the padlock showing that the pane is unlocked as well. So, no risk if no one else has physical access to the machine or those that do don't know the password. Not exactly like anyone can log in with root, requiring no unlocking at all. So, a bug? Yes. A catastrophic and highly embarrassing failure? Not really.

*...and it also provides access at the login screen of a locked Mac.*
 
So it requires physical access to a Mac that's not just "unlocked" but that has the Users dialogue open with the padlock showing that the pane is unlocked as well. So, no risk if no one else has physical access to the machine or those that do don't know the password. Not exactly like anyone can log in with root, requiring no unlocking at all. So, a bug? Yes. A catastrophic and highly embarrassing failure? Not really.
It also works from a guest account.
 
I'm not sure why it's not working for some, but one possible reason might be the Server app. I have it installed, and the second attempt let me in.

There are some who recommend enabling the root account, setting a password, then disabling it again. This is wrong. You can perform the hack again when root is disabled. Just leave it enabled with a proper password.
 
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