Access reviews matter because sign-in only proves that an identity was accepted, not that its permissions remain appropriate. Users often keep access after role changes, project changes, or business transitions. Reviews expose that drift and force the organisation to decide whether the entitlement still has a legitimate business purpose.
Why This Matters for Security Teams
Successful sign-in only proves that authentication happened. It does not prove the account still needs the same entitlements, that the access matches current job duties, or that stale privileges have not accumulated after a transfer, promotion, or acquisition. That is why access reviews remain a core control in identity governance, including for NHIs where access often expands quietly over time. In the Ultimate Guide to NHIs, NHI Mgmt Group notes that 97% of NHIs carry excessive privileges, which shows how quickly permission drift becomes an operational risk.
Reviews are not a paperwork exercise. They are one of the few opportunities to force an explicit business decision: keep, reduce, or remove access. Without that step, organisations tend to treat authentication as proof of legitimacy, when it is only proof of possession of valid credentials. OWASP’s OWASP Non-Human Identity Top 10 reflects the same pattern for machine access, where standing entitlements persist long after the original need has changed. In practice, many security teams encounter over-permissioned accounts only after an audit, incident, or failed offboarding process has already exposed the gap.
How It Works in Practice
An effective access review process compares actual entitlements against current business context, not just against yesterday’s approval record. For human users, that means confirming manager, department, project, and data sensitivity. For machine identities, it means checking whether a service account, API key, or workload identity still supports an active workload, and whether the credential scope still matches the task. The review outcome should be action-oriented: certify, reduce, or revoke.
Current best practice is to use evidence that helps reviewers make a real decision, such as last use timestamp, privilege level, resource sensitivity, ownership, and ticket history. NHI Mgmt Group’s NHI Lifecycle Management Guide is especially relevant here because lifecycle controls and access reviews should reinforce each other. If a credential is old, unused, or no longer tied to an owned system, the review should not preserve it by default.
- Set review frequency by risk, not by calendar convenience.
- Require business owners to attest to need, not just to existence.
- Use usage telemetry to identify dormant or anomalous access.
- Remove standing access when a just-in-time model is viable.
- Escalate exceptions for privileged, third-party, or shared identities.
Where available, pair review workflows with policy and inventory data from identity governance, PAM, and secrets management so reviewers see the full entitlement picture. For machine access, that includes checking secret rotation status, ownership, and whether a workload can move to short-lived credentials instead of long-lived keys. This guidance tends to break down in environments with poor identity inventory, because reviewers cannot certify what they cannot see.
Common Variations and Edge Cases
Tighter review controls often increase operational overhead, requiring organisations to balance assurance against reviewer fatigue and business disruption. That tradeoff is real, especially in high-change environments where roles, projects, and deployments move quickly. Access reviews still matter, but current guidance suggests they should be risk-based and evidence-driven rather than treated as a universal annual checkbox.
There is no universal standard for review depth across every identity type. Highly privileged users, privileged service accounts, and third-party access typically need shorter review cycles than low-risk, low-impact entitlements. For NHIs, the bar should be stricter when the account can reach production, customer data, or secrets infrastructure. The 52 NHI Breaches Analysis reinforces that machine identities are often not the problem until they become the path through which attackers move.
Some organisations also over-rely on sign-in logs or periodic reauthentication as a substitute for access review. Those signals are useful, but they do not answer the governance question: should this identity still have this permission at all? Effective programs treat authentication, review, and removal as separate controls that work together. If entitlements are never challenged, successful sign-in simply becomes proof that stale access is still being used.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Addresses excessive and stale machine privileges that reviews are meant to catch. |
| NIST CSF 2.0 | PR.AC-4 | Access permissions management is directly about validating who can keep what access. |
| NIST AI RMF | GOVERN | Governance requires accountable decisions over identity and access changes. |
Review NHI entitlements on a set cadence and remove access that no longer maps to an active workload.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
