Information
The automatic login feature saves a user's system access credentials and bypasses the login screen, instead the system automatically loads to the user's desktop screen.
Rationale:
Disabling automatic login decreases the likelihood of an unauthorized person gaining access to a system.
Impact:
If Automatic login is not disabled an unauthorized user could login without supplying a user password or credential.
Solution
Perform the following to implement the prescribed state:
Run the following command in Terminal:
sudo defaults delete /Library/Preferences/com.apple.loginwindow autoLoginUser