Access reviews break down when they are treated as the primary control for NHI governance because they happen too slowly and see only snapshots. Many NHI actions occur between review cycles, and many identities are short-lived or ownerless by the time review starts. Reviews still matter, but they cannot substitute for live enforcement.
Why This Matters for Security Teams
Access reviews are useful for governance, but they are a weak primary control for NHI because they are retrospective by design. Non-human identities often act continuously, change owners, or disappear before a quarterly review ever starts. That gap is where privilege creep, orphaned secrets, and unauthorized tool access persist. NHI governance needs live enforcement, not just periodic attestation, which is why frameworks such as the OWASP Non-Human Identity Top 10 and NIST Cybersecurity Framework 2.0 emphasise ongoing control validation rather than paper approval.
NHIMG research shows why the control gap matters operationally: in The State of Non-Human Identity Security, lack of credential rotation was cited as the top cause of NHI-related attacks by 45% of organisations, with inadequate monitoring and logging and over-privileged accounts both at 37%. In practice, many security teams discover this only after a stale service account is used for lateral movement, rather than through intentional review discipline.
How It Works in Practice
Access reviews answer a narrow question: “Should this identity still exist with these entitlements?” That is necessary, but it does not control what happens between review cycles. For NHIs, the stronger operating model is lifecycle enforcement: create identities with a defined owner, bind them to workload or application context, issue only the access needed for the task, and revoke it automatically when the task ends. That is where NHIMG guidance on lifecycle processes for managing NHIs becomes more useful than a static attestation workflow.
In mature environments, review data should feed enforcement, not replace it. A practical model usually includes:
- continuous discovery of NHIs across cloud, SaaS, CI/CD, and API estates
- short-lived credentials or tokens with automatic expiry and revocation
- owner assignment for every identity, secret, and integration
- policy checks at issuance time and at runtime, not only during quarterly attestations
- logging that links each NHI action to a workload, purpose, and approval trail
This approach aligns better with the control logic described in the NHIMG regulatory and audit perspectives and with the OWASP Non-Human Identity Top 10, which treats long-lived secrets and poor lifecycle control as core risks. Reviews then become evidence for governance decisions, exception handling, and recertification of higher-risk access, rather than the mechanism that keeps the environment safe.
These controls tend to break down in fast-moving CI/CD pipelines and ephemeral cloud workloads because the identity can be created, used, and discarded long before the next review window opens.
Common Variations and Edge Cases
Tighter review cadence often increases operational overhead, requiring organisations to balance governance visibility against the cost of interrupting engineering and platform teams. That tradeoff is real, especially when hundreds or thousands of NHIs are involved. Current guidance suggests that high-risk identities should be reviewed more often, but there is no universal standard for how frequent is “enough” across every environment.
Some teams use access reviews effectively for exceptions, dormant accounts, and ownerless assets. That is sensible, but it should not be mistaken for primary control. If an identity is short-lived by design, a review process may never catch its actual behaviour. If a secret is embedded in automation, attestation does not remove the exposure. If access is granted through federated pipelines or service-to-service trust, the review may validate the wrong layer entirely. NHIMG’s Top 10 NHI Issues and the 52 NHI Breaches Analysis both reinforce the same pattern: governance fails when organisations confuse periodic paperwork with continuous control. Reviews are still valuable for auditability and ownership hygiene, but they should confirm a live control system, not substitute for one.
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 | Highlights risks from stale or poorly rotated NHI credentials. |
| NIST CSF 2.0 | PR.AC-4 | Addresses least-privilege and identity lifecycle controls for access governance. |
| NIST AI RMF | Supports governance over autonomous systems that change behaviour between reviews. |
Use NHI-03 to tie access reviews to continuous credential rotation and revocation checks.
Related resources from NHI Mgmt Group
- What breaks when access reviews are used as the main risk control?
- What breaks when access certification is used as the main governance control?
- What breaks when access reviews are the main control for JIT governance?
- Why does relationship-based access control matter for application and NHI governance?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 10, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
