They fail when reviewers see a list of entitlements but not enough context to judge whether the access is still needed. Without usage data, role information, and policy thresholds, certification becomes an approval exercise instead of a removal mechanism. The fix is to review actual use, not just stored permissions.
Why This Matters for Security Teams
Access reviews fail because reviewers are asked to decide on paper entitlements without the operational context needed to judge necessity. That gap is especially dangerous for secrets, service accounts, and AI-connected workloads, where permissions can outlive the task that justified them. NHI Management Group’s Ultimate Guide to NHIs treats lifecycle visibility as foundational, because stale access is rarely obvious from a static export alone.
The problem is not just excess privilege. It is that access reviews often reward familiarity, not evidence. A reviewer sees a long list of roles, tokens, and API scopes, but cannot tell whether a credential is active, whether it is tied to a current workflow, or whether a policy threshold should force removal. OWASP’s OWASP Non-Human Identity Top 10 highlights that these identities are frequently unmanaged at runtime, which makes certification a weak control if it is disconnected from usage.
In practice, many security teams discover unnecessary permissions only after a misuse event, not through a routine review cycle.
How It Works in Practice
effective access review for NHIs starts by replacing entitlement-only certification with evidence-based validation. That means pairing every access item with metadata such as last-used time, workload owner, environment, ticket or approval reference, and the policy that granted it. For agents and automated services, that context should also include the workflow or task the identity is allowed to execute, because static role labels do not capture dynamic behaviour.
Practitioners usually get better results when reviews are driven by thresholds rather than human memory. For example, if a secret has not been used in a defined period, or if an API key is attached to an inactive service, the system should flag it for removal or re-approval. This aligns with the NHI lifecycle approach in the NHI Lifecycle Management Guide, which treats issuance, use, rotation, and retirement as one control surface instead of isolated events.
- Pull current usage telemetry before the review window opens.
- Map each entitlement to a business service, owner, and expiration policy.
- Auto-flag stale permissions that exceed usage, age, or scope thresholds.
- Require approvers to confirm the operational need, not just the job title.
NIST guidance on digital identity reinforces the value of authentication and lifecycle assurance, while the 52 NHI Breaches Analysis shows how often neglected identities become the weakest link. These controls tend to break down in highly distributed environments with many ephemeral workloads because usage data is fragmented across clouds, CI/CD systems, and message queues.
Common Variations and Edge Cases
Tighter review requirements often increase operational overhead, so organisations have to balance removal accuracy against reviewer fatigue and service disruption. That tradeoff is real: aggressive clean-up can break automation, while lenient recertification preserves technical debt. Current guidance suggests using risk tiers so high-impact NHIs are reviewed more frequently than low-risk, short-lived identities.
There is no universal standard for how much telemetry is enough, but the best practice is evolving toward evidence-based recertification. Static secrets that rarely change may warrant different thresholds than ephemeral credentials used by deployment pipelines or AI agents. For example, a token that is expected to live for minutes should not be treated like a long-lived integration key, and a reviewer who sees both in the same list without context will often approve both.
The biggest edge case is shared or inherited access, where one NHI can reach multiple downstream systems through chained permissions. In those environments, removal decisions should be tied to dependency mapping, not just individual entitlements. Where role design is weak or overly broad, access reviews will keep preserving inherited privilege instead of eliminating it.
For a broader security lens, the DeepSeek breach illustrates how quickly exposed or overextended identities can compound into larger control failures. Best practice is to treat reviews as a removal pipeline, not a ceremonial sign-off.
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 SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Addresses stale or excessive non-human identity permissions. |
| NIST CSF 2.0 | PR.AC-4 | Covers access approval and permission management for identities. |
| NIST SP 800-63 | Supports identity lifecycle assurance and credential governance. |
Use usage evidence and expiry thresholds to remove permissions that no longer support an active workload.
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
