System admin appearing on lock screen after stand by

Unfortunately these settings do not help.

Another addition: Logging in with my Apple Watch also does not work. Changing the respective setting (turning Watch login on or off) does not have any influence on the "System Administrator" behaviour.

etrecheck did not find anything noteworthy. Then I rebooted to single user mode and did fsck. It found and corrected a problem.

Result: the System Administrator does not show up anymore! ✅ Hooray! 🙂

I still cannot login with my Apple Watch, but I guess that's a different issue. 😢

Oh well.

Right after writing the above my MacBook Pro's battery ran empty, system shut down, and after connecting it to power I was greeted with the System Administrator login.

I don't think anymore there is a problem with my system, to me this seems to be a High Sierra bug.

I got this problem also right after updating to High Sierra: Two users logged in, other one always getting System Administrator login screen when waking up from sleep. I hadn't restarted the computer since the High Sierra installation process, but when I did the problem went away. No more sys admin login screen for either of the logged in users.

Also, EVERYONE should mitigate this massive bug by setting a custom "root" superuser password immediately. It is not hyperbole to say this is the most severe OS X/macOS privilege error ever. I suspect Apple will also have an official fix out by tomorrow, or perhaps in two days at the latest.

If you think it's even remotely possible for someone to have physical access to your locked, encrypted Mac until Apple releases the official fix, you are vulnerable to complete access unless you set a custom password for "root".

I had the same issue and just fixed it.

If I am right, you have Admin privileges and your wife hasn't (this was my case),

Here are the steps I took to fix this, hopefully it will work for you.

Log Out the user account (i.e your wife's account - It must be logged Out)

Log on your admin account (i.e yours)

Go to System Preferences > Users and Groups

Click the lock to make Changes

Select the user account (i.e your wife's)

Make this account Admin by clicking "Allow user to Administer this computer"

Restart compter

Log onto the user account (i.e your wife's)

Lock screen

Normally the problem has disappeared

Redo exactly the same but remove admin privileges to the user account (i.e your wife)

Restart and check again.

The issue should have gone (It has for me)

PS1: I hope that Apple will sort this out..

PS2: I had too click twice to remove admin privileges to user account, yet another bug for High Sierra (way too many to my taste...)

For completeness, let me update: After over two weeks without the System Administrator login screen problem, when I had to reboot, because of a OS crash, the issue is back. Only with the difference that now it's attached to the other account of my two accounts in this computer.

I just meant that originally the problem occurred with my work account when I put my computer to sleep. Now it's occurring only with my private account and not with the work account. Both users are always logged in though.

Ok, I thought in the context of this topic I would have made some sense. But to clarify: the issue I was experiencing, after I upgraded to High Sierra, that when I put my computer to sleep and later woke it up, I was greeted with a login screen of a user named "System Administrator". I needed to click 'switch user' to log in with my own account. This problem occurred only with one of my two accounts in my computer, with my so called work account. When I later rebooted my computer, the system admin login screen problem was suddenly gone and I even wrote about in this 'solution' in this discussion thread. Now more than two weeks later, after a reboot, the same login screen problem came back, but this time with the other of my two accounts in this computer. Goes without saying I would like to get rid of it permanently.

Now more than two weeks later, after a reboot, the same login screen problem came back, but this time with the other of my two accounts in this computer.

Sorry, I misunderstood what you meant by "other." I thought you were describing the Login screen showing Other.

I have the same problem too.

MBP 15" 2017 with TB

Started right after upgrading to High Sierra.

I have 2 accounts: 1: Mine (administrator), 2: wife's (user), FireVault enabled for both. Guest account is disabled.

To test it we can just lock screen using wife's account (my account doesn't cause it to show up) and see this 'System Administrator' user show up. If I input wife's password into the password field of 'System Administrator' user her account unlocks (this is the linked behavior described above). TouchID doesn't work when this 'System Administrator' account showed up. I can also click 'Change user' and see the standart user screen with both accounts, names and avatars.

I am having the same problem, which occurred after a recent update. I don’t remember adding root. How would I even check this? I only have two accounts on my MacBook Pro. My wife‘s and mine. Both are admin.

I have this problem also. Just bought a late 2016 15" MacBook Pro with High Sierra. The behavior is as others have described. We have three accounts on this computer. When more than one user is logged in and the system goes to sleep, on waking you are presented with they grey system administrator login. In my case, if you are the most recent user, your password (either touch ID or typed entry) will unlock the system.

For example,

1) I login and use the computer. I finish and computer goes to sleep with me still logged in.

2) My son takes computer and logs in. He finishes, stays logged in, computer goes to sleep.

3) I take computer back and am presented with the System Administrator login. I type my password, doesn't work. I use my fingerprint, doesn't work.

4) My son puts his finger on Touch ID, he is successfully logged back in to his account.

Very annoying, Apple! Please fix!

I have the exact same issue as Axel-F1. I would like to double down on the noted very long delay between switching users. Very un-Mac like behavior. In fact, it is one of the things I tout to Windows users, is showing them how fast a Mac login screen appears and you can log in. I do not have FileVault enabled either, the users are per the expected as in Mike's reply. It has not gone away with the latest updates as of High Sierra 10.13.2.

I am having this problem too.

2016 Macbook Pro 13inch with Touch Bar.

Latest High Sierra - 10.13.3

There are two accounts on my mac - One sys admin, and a standard user. The issue only seems to be happening when the standard user locks the mac (either automatically or by using the lock screen menu option).