Least privilege
The principle of least privilege means granting each user — and each service — only the access needed to carry out their responsibilities, and no more. Learn how to apply least privilege, how it connects to zero trust, and why it is a cornerstone of modern security.
What is the principle of least privilege?
The principle of least privilege holds that every user, account, and process should have only the access required to do its job — nothing more. Excess access is standing risk: it widens what an attacker can reach if an account is compromised, and what a mistake or insider can affect. Least privilege keeps that surface as small as possible.
How do you apply least privilege?
Least privilege is applied through a set of complementary practices:
- Role-based access control — grant access by role rather than by individual.
- Just-in-time access — grant elevated rights for a limited window, not permanently.
- Regular access reviews — remove access that is no longer needed.
- Separating duties — avoid concentrating too much power in one account.
- Removing standing privilege — eliminate always-on administrative rights where possible.
Least privilege and zero trust
Least privilege is a foundational element of a zero-trust approach. Zero trust assumes no user or system should be trusted by default; least privilege is how that assumption is enforced at the level of access — every request granted the minimum needed, verified rather than assumed. Together they shrink both the likelihood and the blast radius of a compromise.
Why does least privilege matter?
Most damaging breaches escalate through excess access — an attacker compromises one account and finds it can reach far more than it should. Least privilege limits that escalation, contains mistakes, and simplifies audit by making access intentional and reviewable. It is one of the highest-leverage principles in security, and central to privileged access management.
Frequently asked questions
What is the principle of least privilege?
The principle of least privilege means granting each user, account, and process only the access needed to carry out its responsibilities, and no more. Excess access is standing risk, so least privilege keeps the attack surface as small as possible.
How do you implement least privilege?
Least privilege is implemented through role-based access control, just-in-time access, regular access reviews, separation of duties, and removing standing administrative privilege where possible.
How does least privilege relate to zero trust?
Least privilege is a foundational element of zero trust. Zero trust assumes no user or system should be trusted by default, and least privilege enforces that at the access level — every request granted the minimum needed and verified rather than assumed.
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Related terms
Privileged access management (PAM)
Controls, audits, and secures access to an organization's most sensitive systems.
Read now →Role-based access control (RBAC)
A hierarchy of permissions determining what a user can do based on their role.
Read now →Just-in-time access (JIT)
Granting elevated access only for a limited time window, then revoking it.
Read now →