The operating system must disable accounts when the accounts are no longer associated to a user.

Disabling expired, inactive, or otherwise anomalous accounts supports the concepts of least privilege and least functionality which reduce the attack surface of the system.

Verify the operating system is configured to disable accounts when the accounts are no longer associated to a user.

If the operating system is not configured to disable accounts when the accounts are no longer associated to a user, this is a finding.

Configure the operating system to disable accounts when the accounts are no longer associated to a user.