Windows comes with the built-in account called “Guest”. Since this account is seldomly used, you may want to disable it. Else, its well-known name could serve as a vector for attackers.

Since the account name is localized and can slightly vary from culture to culture, to identify the account use its SID:

 
PS> Get-Localuser | Where-Object Sid -like 'S-1-5-*-501'

Name  Enabled Description 
----  ------- ----------- 
Guest False   Built-in account for guest access to the computer/domain  
 

If the account isn’t already disabled (see “Enabled” property), use an elevated PowerShell and the Disable-LocalUser cmdlet to disable the account.




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