NIST SP 800-53 Rev. 5 PS-4 — Personnel Termination

What this control requires

Upon termination of employment, the organization should disable system access, revoke any associated authentications, and retrieve all system-related property. Additionally, an exit interview should be conducted, covering relevant security topics, and access to organizational systems should be retained for the terminated individual. This ensures proper security controls and accountability are maintained after termination. This control supports the Governance capability within the Personnel Security family.

In plain English

Upon termination of employment, the organization should disable system access, revoke any associated authentications, and retrieve all system-related property. In practice, this means you can prove you disable 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 Personnel Security, the assessor will trace your implementation back to the catalogue reference (Control PS-4) 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

• Disable. Document the trigger, the owner and the cadence.
• Access. Document the trigger, the owner and the cadence.
• Individual. Document the trigger, the owner and the cadence.
• Security. Document the trigger, the owner and the cadence.
• Review. Document the trigger, the owner and the cadence.
• Scope: management, organization, system, individual, personnel, termination, controls, security controls.

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: Personnel Termination.

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 3.9.2 — Personnel Termination and Transfer
• CIS Controls v8 9.2 — Use DNS Filtering Services
• ISO/IEC 27001:2022 A.5.2 — Information security roles and responsibilities
• SOC 2 (2017 TSC) CC6.1 — Logical Access Controls
• ISO/IEC 27701:2025 A.3.8 — Identity management

Related controls in NIST SP 800-53 Rev. 5

• Control PS-4(2) — Automated Actions
• Control PS-3(3) — Information Requiring Special Protection Measures
• Control MA-5(5) — Non-System Maintenance
• Control SC-7(28) — Connections To Public Networks
• Control AU-10(1) — Association Of Identities
• Control PS-6(3) — Post-Employment Requirements

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control PS-4

Topics: identity accessidentity managementaccess reviewprivileged access