What is the principle of least privilege, and how should it guide how you grant permissions in SQL Server?

Intermediate

Answer

The principle of least privilege means giving a user or application only the specific permissions they actually need to perform their job, and nothing more, reducing the potential damage that could occur from a mistake, a compromised account, or a security vulnerability, since an account with limited permissions can only cause limited harm even in the worst case.

-- Grant only what is specifically needed
GRANT SELECT ON Orders TO ReportingApp;
-- Avoid granting broad permissions like db_owner unless truly necessary

Real-world example A company grants their reporting application account only SELECT permission on the specific tables it actually needs, rather than the much broader db_owner role, significantly limiting potential damage if that application's credentials were ever compromised.

Common follow-ups: How do you audit whether existing accounts have more permissions than they actually need?;What is a reasonable process for regularly reviewing and tightening permissions over time?

Dynamic Data Masking;Backup & Recovery

All 7 SQL Server Security & Permissions questions