Manual reviews break when entitlement changes outpace the review cadence. By the time a reviewer looks at the access, the risk may already have moved, the owner may have changed, or the access may have become normalised. This leads to stale certifications, low-confidence approvals, and growing privilege creep across both human and non-human identities.
Why This Matters for Security Teams
Manual access reviews assume identity state is relatively stable long enough for a human certifier to make a meaningful judgment. That assumption breaks in modern environments where service accounts, API keys, workload tokens, and agent credentials change faster than quarterly or monthly review cycles. When reviewers approve outdated entitlements, the organisation is effectively certifying yesterday’s risk, not today’s.
This is especially visible in non-human identity estates, where the volume and turnover of credentials are materially higher than most teams expect. NHIMG notes that Ultimate Guide to NHIs shows only 5.7% of organisations have full visibility into their service accounts, which makes manual certification inherently incomplete. The broader pattern is reflected in the OWASP Non-Human Identity Top 10, where stale credentials and excessive privilege are recurring failure modes.
In practice, many security teams discover privilege creep only after an audit exception, a broken offboarding event, or a credential-led incident has already exposed the gap.
How It Works in Practice
Manual reviews fail because access recertification is a point-in-time control applied to a continuously changing identity graph. By the time a reviewer sees an entitlement, the underlying workload may have been redeployed, the owning team may have changed, the API may no longer be used, or the credential may have been duplicated into a new pipeline. The result is not just delay, but false confidence.
A more effective model combines inventory, context, and automation. Teams should continuously discover identities and entitlements, then classify them by owner, workload, environment, and business criticality. Reviews should be triggered by change events, not only by calendar schedules. Where possible, access should be tied to lifecycle signals such as job completion, service retirement, application release, or environment teardown.
- Use identity inventory to expose orphaned or duplicated accounts before certification starts.
- Bind each entitlement to a clear business or technical owner so reviewers can make a real decision.
- Shorten credential lifetimes and rotate secrets automatically rather than waiting for review outcomes.
- Pair review workflows with policy enforcement so excessive access can be removed, not merely noted.
For non-human identities, this means aligning with lifecycle controls such as the NHI Lifecycle Management Guide and treating review evidence as one input, not the control itself. The practical goal is to shrink the window in which access can drift unnoticed, while using current guidance from the OWASP Non-Human Identity Top 10 to prioritise the most exposed credentials. These controls tend to break down in fast-moving CI/CD environments because ownership, secrets, and permissions can change between scans and approvals.
Common Variations and Edge Cases
Tighter review cadences often increase operational overhead, requiring organisations to balance governance quality against reviewer fatigue and release velocity. That tradeoff is real, especially where thousands of ephemeral identities exist or where access is granted through automated pipelines rather than tickets. Current guidance suggests that the answer is not simply “review more often,” but “review the right things with better context.”
Some environments can safely reduce manual review dependence by shifting to zero standing privilege, short-lived credentials, and event-driven revocation. In others, especially legacy platforms or shared service estates, manual certification remains necessary but should be targeted at high-risk entitlements only. There is no universal standard for this yet, but best practice is evolving toward continuous assurance rather than periodic attestation.
NHIMG’s Top 10 NHI Issues highlights why this matters: excessive privilege, poor rotation, and weak visibility make manual approval a weak compensating control when identities are changing faster than human review cycles can keep up. Teams that rely on static certification for dynamic systems usually find that the review process becomes a reporting exercise rather than a risk reduction mechanism.
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 | Manual reviews miss stale or unrotated NHI credentials. |
| NIST CSF 2.0 | PR.AC-4 | Access review failure is a privilege management weakness. |
| NIST AI RMF | Fast-changing identity environments need ongoing risk monitoring. |
Continuously inventory NHI credentials and revoke or rotate access when entitlement drift is detected.
