What is the Guest user account? Explain in brief.

1.	What is the Guest user account? Explain in brief.
Answer» The Guest user account is created by default with SQL server installation. Guest user is not MAPPED to any login but can be used by any login when explicit permissions are not granted to access an object. You can drop the guest user from all databases except Master and TempDB. When any user login to the SQL Server, it has 2 parts Server & database. First, at the Server level, user authentication VERIFIES at the server level and User is able to login to SQL Servers. Second, Login and mapping to the database are verified. In case, Login is not mapped to any user but able to log in on SQL server. SQL automatically map that login to Guest and GRANT him database access. One of the security recommendations of Microsoft is to Drop or disable a Guest user in every database except Master & TempDB database. By having Guest user, you are at risk of unauthorized access to data.

Answer»

The Guest user account is created by default with SQL server installation. Guest user is not MAPPED to any login but can be used by any login when explicit permissions are not granted to access an object. You can drop the guest user from all databases except Master and TempDB.

When any user login to the SQL Server, it has 2 parts Server & database. First, at the Server level, user authentication VERIFIES at the server level and User is able to login to SQL Servers. Second, Login and mapping to the database are verified. In case, Login is not mapped to any user but able to log in on SQL server. SQL automatically map that login to Guest and GRANT him database access.

One of the security recommendations of Microsoft is to Drop or disable a Guest user in every database except Master & TempDB database. By having Guest user, you are at risk of unauthorized access to data.

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