Guest Permissions on User Databases
This rule determines whether the guest user has permission to access the database. This rule applies to user databases only.
Best Practices Recommendations
Revoke the guest user permission to access the database if it is not required.
The guest user cannot be dropped, but guest user can be disabled by revoking its CONNECT permission by executing REVOKE CONNECT FROM GUEST within any database other than master, tempdb, or msdb.
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See Also
Monitor and Enforce Best Practices by Using Policy-Based Management