iMac login page displays an additional user labelled other

And you never enabled Root?

0

The solution to this is to Disable Root User. To do that, go to:

System Preferences > Users & Groups > Unlock Button (and put in password) > Login Options > Network Account Server: click "Join" > Open Directory Utility > Unlock Button (and put in password) > Edit Menu (at the top) > DISABLE ROOT USER

Once you've done that, the Other... user should be gone from the login screen.

Alternatively, you can get to Directory Utility using Spotlight (command + spacebar) then typing Directory Utility, and pressing enter.

Hiya,

Is guest account enabled?

Login screen shows User called Other afte… - Apple Community

macos - A mysterious "Other…" user has appeared on my login screen - Ask Different (stackexchange.com)

I'm unable to boot into Ventura at this time to look there, sorry, but yeah, think you're right on that.

See if you have unknown Profiles.

To remove a configuration profile in macOS:

1. From the Apple menu, select System Preferences....
2. From the View menu in System Preferences, select Profiles.Note:
3. Profiles won't be visible until you have at least one profile installed.
4. Select the profile you want to remove, and then press the - (minus) button. Click Remove to remove the profile.

System Settings in Ventura...

I don't think you have any worries at all.

The free Malwarebytes may give you peace of mind...

https://www.malwarebytes.com/mac/

OK, what are any signs that think you were hacked?

Does the other additional user have an actual name or is it "Other"?