Vulnerability Discussion
Disabling expired, inactive, or otherwise anomalous accounts supports the concepts of least privilege and least functionality which reduce the attack surface of the system.
Check
Verify the container platform is configured to disable accounts when the accounts are no longer associated to a user.
If the container platform is not configured to disable accounts when the accounts are no longer associated to a user, this is a finding.
Fix
Configure the container platform to disable accounts when the accounts are no longer associated to a user.