Periodic reviews fail when access changes faster than the review cycle and when the organisation relies on manual evidence collection. By the time managers certify access, the snapshot is already stale. Continuous telemetry and event-driven lifecycle controls are needed to keep decisions aligned with current risk.
Why This Matters for Security Teams
Periodic access reviews are still widely used because they are easy to schedule, document, and report on. The problem is that they measure yesterday’s access posture, not today’s risk. When service accounts, API keys, and automation identities change outside the review window, a certified snapshot can create false confidence while exposure continues to grow. NHI Management Group notes that only 5.7% of organisations have full visibility into their service accounts, which helps explain why reviews often miss the identities that matter most. See the Ultimate Guide to NHIs and the NIST Cybersecurity Framework 2.0 for the broader governance context.
For NHI risk, the core issue is not just whether access was approved once. It is whether the identity still needs the privilege, whether the secret is still valid, and whether the workload using it has changed. In practice, many security teams encounter excessive access only after a compromise, a failed audit, or a production incident, rather than through intentional review.
How It Works in Practice
Effective identity risk reduction depends on moving from periodic attestation to event-driven control. That means tying access decisions to lifecycle events such as workload creation, credential issuance, privilege escalation, secret rotation, and decommissioning. The NHI Lifecycle Management Guide is a useful reference for understanding why access should be removed or re-scoped when the underlying service, pipeline, or integration changes.
Practically, this requires a few control layers working together:
- Continuous inventory of humans, service accounts, API keys, and tokens, not just directory groups.
- Automated expiry and rotation for secrets so access cannot outlive its business need.
- Telemetry that shows actual use, so dormant access can be identified and removed.
- Policy decisions at request time, rather than dependence on a quarterly certification cycle.
That model aligns with guidance from the OWASP Non-Human Identity Top 10, which emphasises that NHI risk is driven by mismanaged credentials, excessive privilege, and weak lifecycle governance. NHIMG research also shows that 97% of NHIs carry excessive privileges, which means reviews often preserve overreach instead of reducing it. The operational goal is not simply to ask whether access exists, but whether access is still justified by current system state and observed behaviour. These controls tend to break down when identities are embedded in code, CI/CD pipelines, or third-party integrations because ownership is unclear and evidence collection becomes incomplete.
Common Variations and Edge Cases
Tighter access governance often increases operational overhead, requiring organisations to balance stronger control against delivery speed and support effort. There is no universal standard for this yet, especially in environments where secrets are provisioned dynamically or where teams rely on inherited cloud permissions. In those cases, a formal review may still be useful for accountability, but it should be treated as a secondary control, not the primary one.
Some environments need different treatment. Long-lived production service accounts may require periodic attestation plus automated anomaly detection. Short-lived automation credentials are better handled through JIT issuance and revocation rather than manual recertification. Third-party integrations are another exception: if a vendor token is shared across multiple systems, a review may confirm ownership but still fail to reveal hidden blast radius. Current guidance suggests pairing review processes with secret inventory, usage telemetry, and least-privilege enforcement so stale access is removed as soon as risk changes. See also the 52 NHI Breaches Analysis and the Top 10 NHI Issues for common failure patterns.
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 | Periodic reviews fail when NHI credentials stay valid too long. |
| NIST CSF 2.0 | PR.AC-4 | Access reviews are a least-privilege control that needs current evidence. |
| NIST AI RMF | Lifecycle governance should track changing risk, not one-time approval. |
Establish ongoing monitoring and accountability for identities tied to dynamic systems.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 23, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
