NIST SP 800-53 Rev. 5 AC-2(11) — Usage Conditions

What this control requires

Organizations must enforce defined usage conditions for system accounts, such as restricting usage to specific times, days, or durations. This ensures the principle of least privilege, increases user accountability, and allows effective account monitoring. Alerts should be generated if accounts are used in violation of organizational parameters. This control supports the Governance capability within the Access Control family.

In plain English

Organizations must enforce defined usage conditions for system accounts, such as restricting usage to specific times, days, or durations. In practice, this means you can prove you account management-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

This control is rated high. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation.

What an auditor looks for

A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within Access Control, the assessor will trace your implementation back to the catalogue reference (Control AC-2(11)) and look for objective evidence on the latest two assessment cycles.

How to implement

1. Write a short policy stating intent, scope and named owner.
2. Encode it as a platform guardrail — SCP, Azure Policy initiative, Organisation Policy, or repository policy.
3. Wire a monitoring signal that catches drift (CSPM rule, SIEM rule, scheduled query, Workspace alert) and ticket it.
4. Review on a documented cadence and capture the review in the risk register or compliance tracker.

Operational checklist

• Account. Document the trigger, the owner and the cadence.
• Usage. Document the trigger, the owner and the cadence.
• Access. Document the trigger, the owner and the cadence.
• Least. Document the trigger, the owner and the cadence.
• Review. Document the trigger, the owner and the cadence.
• Scope: management, accounts, conditions, days, durations, access control, system, privilege.

Evidence to collect

• Identity Scan. IAM / IdP exports — Entra ID, Okta, IAM Identity Center, Workspace directory — showing accounts, roles, MFA state and last sign-in.

Identity analytics (Okta, SailPoint, Access Analyzer) demonstrates least-privilege. Focus: Usage Conditions.

How it maps to other frameworks

Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit.

• NIST SP 800-171 Rev. 3 3.1.7 — Least Privilege - Privileged Functions
• CIS Controls v8 6.7 — Centralize Access Control
• BSI C5:2020 PS-04 — Physical site access control

Related controls in NIST SP 800-53 Rev. 5

• Control AC-6(10) — Prohibit Non-Privileged Users From Executing Privileged Functions
• Control AU-6(7) — Permitted Actions
• Control AC-6(6) — Privileged Access By Non-Organizational Users
• Control AC-10 — Concurrent Session Control
• Control AC-3(12) — Assert And Enforce Application Access
• Control AC-6(2) — Non-Privileged Access For Nonsecurity Functions

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control AC-2(11)

Topics: identity accesslogging monitoringidentity managementaccess reviewprivileged accesscontinuous monitoring