Identity management can show which accounts exist, but it cannot prove those accounts are still appropriate. Access reviews matter because they revalidate entitlement against role, policy, and business need after the grant event. Without that governance step, organisations often keep technically valid access that is no longer justified, which is how privilege creep becomes persistent.
Why Access Reviews Matter Beyond Account Inventory
Identity platforms can tell a security team that an account exists, when it was created, and whether it is active. They cannot prove that the access still matches the current job, system purpose, or risk posture. That gap is why access reviews remain essential: they validate entitlement after the grant event, when business context has usually changed. The problem is especially visible in NHI environments, where long-lived service accounts and API keys often outlive the workflow they were issued for.
NHIMG research shows the scale of the issue: Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, a pattern that turns “known accounts” into a hidden control failure. The OWASP Non-Human Identity Top 10 also treats entitlement sprawl as a security issue, not a housekeeping issue. In practice, many security teams discover over-entitled accounts only after a service is repurposed, a team changes, or a breach review exposes access that no longer has a business owner.
How Access Reviews Actually Reduce Privilege Creep
Access reviews work by reattesting access against a current decision standard, not by rechecking whether the account object still exists. For human identities, that means confirming role, manager, and business need. For NHIs, it means confirming workload purpose, owner, environment, rotation status, and whether the entitlement is still required for the specific integration. The most effective reviews are evidence-driven and tied to policy, not subjective approval chains.
Operationally, teams should review:
- Who owns the account or secret and who can revoke it.
- What systems the account can reach and whether each entitlement is still required.
- Whether the credential is static, rotated, or eligible for just-in-time replacement.
- Whether the account is covered by Zero Trust policy and least-privilege enforcement.
This is where the Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs is useful: access review is one checkpoint in a broader lifecycle that includes issuance, rotation, monitoring, and offboarding. NIST’s Cybersecurity Framework 2.0 reinforces the same principle through continuous governance and access management outcomes. The practical goal is simple: remove technically valid access that is no longer defensible. These controls tend to break down in organisations with no authoritative owner for service accounts, because no one can confidently attest whether the access is still justified.
Where Reviews Break Down and What to Do About It
Tighter access review processes often increase operational overhead, requiring organisations to balance stronger entitlement control against review fatigue and delayed changes. That tradeoff is real, especially when hundreds or thousands of NHIs are involved and the business expects uninterrupted service.
Best practice is evolving, but current guidance suggests using risk-based review intervals rather than treating every account the same. High-risk accounts, production secrets, privileged API keys, and externally exposed NHIs should be reviewed more frequently than low-impact internal service accounts. Reviews also need to align with rotation and offboarding, otherwise teams approve an account that remains technically valid long after the underlying need has disappeared. NHIMG’s Top 10 NHI Issues and the broader Ultimate Guide to NHIs — Key Challenges and Risks both point to the same operational reality: visibility without governance creates a false sense of control.
For mature programmes, access reviews should feed automated revocation workflows, not just audit evidence. The review is the decision point; enforcement must follow immediately. Without that final step, organisations accumulate approved but obsolete access that becomes indistinguishable from legitimate entitlement.
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 | Access reviews help detect and remove excessive NHI privileges. |
| NIST CSF 2.0 | PR.AC-4 | PR.AC-4 aligns with reviewing and limiting authorized access. |
| NIST AI RMF | AI RMF governance supports ongoing accountability for access decisions. |
Use access reviews to keep privileges current, least-privileged, and tied to approved roles or workloads.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 11, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
