What is Least Privilege?

What is Least Privilege?

Least privilege is a security principle that limits user, application, and system access to only the resources and permissions necessary to perform a specific function — nothing more. By minimizing the access footprint, organizations reduce the potential damage from compromised accounts, insider threats, and accidental misuse.

Why least privilege matters

Excessive permissions are one of the most common security weaknesses. When users have more access than they need:

• A compromised account gives attackers a wider attack surface
• Accidental changes to sensitive systems become more likely
• Insider threats are harder to detect and contain
• Audit findings for excessive access are common compliance gaps

Implementing least privilege

• Start with zero access — new accounts should have no permissions by default, with access granted based on documented role requirements
• Use role-based access control (RBAC) — define roles with specific permission sets rather than assigning permissions individually
• Conduct regular access reviews — quarterly reviews of user permissions help identify and remove access that is no longer needed
• Remove access promptly — revoke permissions immediately when employees change roles or leave the organization
• Apply to systems and applications too — service accounts, APIs, and automated processes should also follow least privilege

Least privilege in compliance frameworks

• SOC 2 — CC6.1 through CC6.3 require logical access controls based on least privilege
• ISO 27001 — A.5.15 (access control) and A.8.2 (privileged access rights) explicitly reference least privilege
• HIPAA — the minimum necessary standard (45 CFR 164.502(b)) is the healthcare equivalent of least privilege
• PCI DSS — Requirement 7 restricts access to cardholder data on a need-to-know basis
• NIST CSF — PR.AC-4 addresses access permissions based on least privilege

How episki helps

episki tracks access control policies, schedules periodic access reviews, and documents evidence of least privilege enforcement for auditors. Learn more on our compliance platform.