DataTerminology.comNEW
A security principle granting only the minimal access necessary for a user or process to perform tasks.
DESCRIPTION
Least Privilege restricts identities and processes to the smallest set of permissions required, reducing blast radius and insider risk. It is implemented via RBAC or ABAC, just-in-time access, and periodic reviews. Automation and governance enforce policy and detect privilege creep. Least Privilege complements segmentation and Zero Trust to control lateral movement. It protects sensitive data and critical systems by narrowing authorized operations.
ALTERNATIVE DEFINITIONS
NIST CSRC Glossary
The principle that users and programs should operate using the least set of privileges necessary to complete the job.
Concise operational statement for users and programs.
Saltzer & Schroeder (1975)
Every program and every privileged user of the system should operate using the least amount of privilege necessary to complete the job.
Original articulation of the principle in classic security design.
RELATED TERMS
Zero Trust RBAC Attribute-Based Access Control Segregation of Duties Just-In-Time Access Privilege Escalation Access Control Identity Management Principle of Least Authority Default Deny
COMPETING TERMS
Default Allow Implicit Trust
KNOWLEDGE AREAS
Data Security Data Governance Infrastructure Software Engineering
TARGET AUDIENCE
Security Architect Cybersecurity Engineer Chief Information Security Officer IT Manager Cloud Architect Data Steward
EXTERNAL SOURCES
- Wikipedia - Principle of least privilege
- NIST - Authoritative glossary definition.
- CIS Controls - Practical least privilege controls.
- Microsoft - Privileged access and least privilege guidance.
TOP QUESTIONS
Why is Least Privilege important?
It limits the damage from compromised accounts or software bugs by constraining what identities can do. Smaller privilege sets reduce attack surface and audit scope.
Category: Relevancy
How is Least Privilege implemented in practice?
Use RBAC/ABAC, just-in-time elevation, approval workflows, and automated reviews. Start with deny-by-default and add only necessary permissions.
Category: Application
What is the biggest misunderstanding about Least Privilege?
That it hurts productivity. Properly designed roles and automation provide access when needed while minimizing risk.
Category: Misunderstanding
What are common mistakes when applying Least Privilege?
Granting broad admin roles, not reviewing access regularly, and failing to remove temporary permissions. These lead to privilege creep.
Category: Mistakes
How does Least Privilege fit into Zero Trust?
Least Privilege enforces minimal access after verification, aligning with Zero Trust’s continuous evaluation and segmentation principles.
Category: Relationship
How often should permissions be reviewed under Least Privilege?
At least quarterly for high-risk roles, and during role changes or offboarding. Automate attestations whenever possible.
Category: Best practices
What tools support Least Privilege?
Identity governance, PAM solutions, CSPM/IAM analyzers, and cloud-native IAM policy tooling help define and verify minimal permissions.
Category: Tooling
How do you measure progress on Least Privilege?
Track the reduction of high-privilege accounts, unused permissions, and successful privilege escalations detected in monitoring.
Category: Measurement
Does Least Privilege apply to services and automation?
Yes. Service principals and CI/CD pipelines need scoping to minimal actions, with short-lived credentials and tight role boundaries.
Category: Scope