They should validate lifecycle automation, not replace it. Service accounts, API keys, and application tokens need ownership, expiry, and offboarding triggers just like human access needs joiner-mover-leaver controls. The review process should confirm that machine identities were created, rotated, and retired according to policy.
Why Access Reviews Matter in NHI Lifecycle Governance
Access reviews are still useful for non-human identities, but their purpose is narrower than many teams assume. For service accounts, API keys, and application tokens, the review should verify that lifecycle controls actually happened: ownership was assigned, the secret was rotated on schedule, expiry was enforced, and offboarding ran when the workload changed or was retired. That is consistent with the lifecycle emphasis in the NHI Lifecycle Management Guide and the broader patterns documented in Top 10 NHI Issues.
The real value of review is evidencing governance, not manually rediscovering what automation should already know. A reviewer should be able to confirm that a machine identity still has a legitimate business purpose, that its access matches the current workload, and that stale credentials have not survived a decommissioning event. The OWASP Non-Human Identity Top 10 treats weak lifecycle handling as a core risk because dormant identities, orphaned secrets, and uncontrolled privilege accumulation are common failure modes. In practice, many security teams discover review gaps only after an application is already retired or a token has remained active long past its intended owner.
How Access Reviews Should Support Lifecycle Controls
Access reviews work best when they validate the control plane around NHI lifecycle management. For a given machine identity, the reviewer should be able to answer four questions: who owns it, what workload uses it, when it expires, and what event retires it. That is why access review evidence should map back to provisioning workflows, secret rotation jobs, and deprovisioning triggers rather than just a spreadsheet of entitlements.
In mature programs, the review process checks whether lifecycle automation executed as designed. That includes:
- ownership assigned to a named team or system of record
- time-to-live or rotation interval set according to policy
- credentials scoped to a single application or purpose
- retirement or revocation triggered by workload shutdown, ownership transfer, or inactivity
This approach aligns with the Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs, which frames lifecycle as a continuous process rather than a one-time approval. It also fits the risk lens in the NIST Cybersecurity Framework 2.0, where governance, asset management, and protective controls reinforce one another. Reviews should therefore flag exceptions, stale exceptions, and missing evidence of automation, not become the primary mechanism for granting or removing access.
For example, if a token is marked "approved" but has no expiry, no clear owner, and no documented retirement trigger, the review should fail it even if the application still appears to function. That failure mode is especially common in environments with shared service accounts, manually created API keys, or secrets copied into multiple deployment pipelines because the underlying lifecycle is already fragmented.
Where Reviews Break Down and What to Do Instead
Tighter review cadence often increases operational overhead, so organisations have to balance auditability against the cost of verifying identities that may change daily. Current guidance suggests that access reviews should become lighter and more exception-driven as lifecycle automation improves, not heavier and more manual.
One useful operating model is to separate stable controls from exception handling. Stable controls are enforced automatically: ownership records, expiry, rotation, and revocation. Reviews then focus on drift, such as a token that outlived its workload, an account that was reused by a different application, or a secret that was duplicated outside the approved vault. The Guide to the Secret Sprawl Challenge is especially relevant here because duplicated and scattered secrets make it difficult for reviewers to tell whether access is still justified. The report The 2024 ESG Report: Managing Non-Human Identities notes that 72% of organisations have experienced or suspect a breach of non-human identities, which is a strong signal that manual review alone is not enough.
In high-churn CI/CD, ephemeral cloud workloads, or agent-driven systems, periodic access review can lag behind reality because the identity may be created and retired between review cycles. In those environments, event-driven controls and continuous discovery matter more than quarterly attestations, and review should primarily validate the automation that keeps pace with change.
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 CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Lifecycle gaps are a primary NHI risk, especially stale or unrotated credentials. |
| NIST CSF 2.0 | PR.AC-4 | Access reviews support least-privilege validation for non-human identities. |
| NIST CSF 2.0 | GV.OV-01 | Governance oversight needs evidence that lifecycle automation is operating as intended. |
Verify ownership, rotation, expiry, and revocation evidence for every machine identity during review.
Related resources from NHI Mgmt Group
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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
