They should move from broad, calendar-based approvals to evidence-based reviews that focus on actual usage, role fit, and exception handling. Access reviews work best when they are tied to lifecycle events such as role changes and offboarding, and when reviewers see context that explains why an entitlement exists. The goal is fewer rubber-stamp approvals and faster removal of stale access.
Why This Matters for Security Teams
Zero trust programmes only work when access reviews reflect how identities are actually used, not how they were originally classified. Calendar-based certification cycles tend to preserve stale entitlements, miss exception drift, and encourage rubber-stamp approvals. That is especially dangerous for non-human identities, where service accounts, API keys, and automation credentials often outlive the workflow they were created for.
NHIMG research shows that 90% of IT leaders say properly managing NHIs is essential for a successful zero-trust implementation, yet 97% of NHIs still carry excessive privileges in modern enterprises. Those numbers explain why review quality matters more than review volume. Teams need evidence that the entitlement is still needed, still scoped correctly, and still tied to a current business function. The NIST SP 800-207 Zero Trust Architecture model reinforces continuous verification, and the Ultimate Guide to NHIs shows why lifecycle visibility is a prerequisite, not a nice-to-have. In practice, many security teams discover access sprawl only after a stale account has already been used to move laterally or exfiltrate data.
How It Works in Practice
Modern access reviews should move from static attestations to context-rich decisions. Instead of asking only whether an entitlement exists, reviewers should see usage history, last-seen timestamps, owner information, linked application or workflow, and whether the access is covered by an approved exception. That turns the review from a paperwork exercise into a control check.
For non-human identities, the strongest pattern is lifecycle-linked review. Trigger reviews at role change, application retirement, major configuration change, vendor offboarding, and on a fixed cadence for high-risk accounts. If a secret or token has not been used recently, the review should test whether it can be removed or reissued with a shorter TTL. This aligns with the broader guidance in the NHI Lifecycle Management Guide and the Ultimate Guide to NHIs — Standards, which both emphasise lifecycle governance and evidence-based control decisions.
- Show reviewers only the entitlements relevant to the current role or workload.
- Flag unused, over-scoped, or inherited access for automatic challenge.
- Require an explicit business owner for exceptions and time-box them.
- Use policy and telemetry to compare stated need with actual activity.
- Prioritise privileged, long-lived, and externally reachable access first.
Where possible, tie review outcomes to enforcement: revoke, reduce scope, or renew with a shorter expiry. Current guidance suggests that review tools should integrate with identity governance, secret rotation, and ticketing systems so remediation happens immediately after approval decisions. These controls tend to break down when organisations cannot attribute access to a real owner or when logging is too incomplete to prove whether the entitlement is still being used.
Common Variations and Edge Cases
Tighter access review workflows often increase operational overhead, so organisations have to balance review depth against reviewer fatigue and business disruption. That tradeoff is most visible in environments with many inherited entitlements, shared automation accounts, or fast-changing engineering teams.
For human identities, reviewers can usually judge role fit from job function and manager input. For NHIs, that approach is weaker because the access exists to support a workload, not a person. In those cases, the better question is whether the workload still exists, whether it still needs that scope, and whether the secret should be replaced with a short-lived token or workload identity. The OWASP Non-Human Identity Top 10 is useful here because it frames over-privilege and poor lifecycle control as recurring failure modes rather than isolated exceptions.
There is no universal standard for review frequency across all zero trust programmes. Best practice is evolving toward risk-based scheduling, where high-impact entitlements are reviewed more often and low-risk, highly automated access is reviewed through telemetry and policy exceptions. Security teams should avoid treating every approval as equal, especially when a service account is protected by strong compensating controls and a dormant contractor account has broad data access. In practice, the hardest cases are shared accounts, legacy integrations, and vendor-managed access, because ownership and intent are often unclear until an incident forces the issue.
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 Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-4 | Access authorisation reviews map directly to least-privilege governance. |
| NIST Zero Trust (SP 800-207) | Zero trust requires continuous verification instead of periodic trust assumptions. | |
| OWASP Non-Human Identity Top 10 | NHI over-privilege and lifecycle gaps are central to modern access review risk. |
Review entitlements against least privilege and remove access that no longer matches current need.
