Ad hoc manual reviews usually break at scale. They take too long, produce inconsistent decisions, and make it hard to prove who approved what and why. That weakens auditability, slows remediation of non-compliant access, and increases the chance that unnecessary entitlements stay active because reviewers lack timely, complete context.
Why This Matters for Security Teams
Ad hoc manual access certification turns identity governance into a queue management problem instead of a risk reduction control. Reviewers are asked to judge entitlement validity without enough context, so decisions drift toward status quo bias, approval fatigue, and inconsistent interpretation across teams. That matters most for NHIs, where service accounts, API keys, and automation tokens can outlive the workflow they were created for.
When certifications are manual, the business also loses a clean audit trail for who approved access, what evidence was used, and whether remediation actually happened. That weakens zero trust programs and makes it harder to prove least privilege under frameworks such as the OWASP Non-Human Identity Top 10 and NIST SP 800-53 Rev 5 Security and Privacy Controls. NHIMG research shows that 97% of NHIs carry excessive privileges, which is exactly the kind of exposure manual reviews are meant to reduce but often fail to catch in time. In practice, many security teams discover the gap only after an entitlement has already been reused, overprovisioned, or left active for months.
How It Works in Practice
Effective certification needs a current inventory, a clear ownership model, and evidence that the reviewer can actually assess. For NHIs, that means grouping access by workload, environment, and business function rather than by vague human team labels. A reviewer should see the identity type, last use, secret age, privilege scope, downstream dependencies, and any compensating controls before making a decision. That workflow aligns with the broader direction in the Ultimate Guide to NHIs, especially where lifecycle governance and rotation intersect with access review.
Automated certification is usually strongest when it combines policy checks with owner attestation. Common practice is to flag high-risk entitlements for human review while auto-closing clearly stale, duplicate, or unowned access. The review record should capture why access was kept, removed, or deferred, and should feed directly into remediation queues so the decision is not just documented but executed. This is also where 52 NHI Breaches Analysis is useful: breach patterns repeatedly show that standing access and weak oversight compound over time, not in isolation.
- Use authoritative owners for each NHI, not generic shared inboxes.
- Review entitlements against live usage, not only the original request.
- Prioritise privileged, external, and long-lived secrets first.
- Automate revocation where the reviewer does not respond within a defined SLA.
These controls tend to break down when identity data is fragmented across cloud, CI/CD, and SaaS tools because reviewers cannot see the full access path.
Common Variations and Edge Cases
Tighter access certification often increases administrative overhead, requiring organisations to balance review depth against operational speed. That tradeoff is real, and current guidance suggests treating every entitlement the same is less effective than risk-tiering the review cadence and approval logic. High-risk NHIs may need monthly or event-driven review, while low-risk, tightly scoped automation identities can be sampled on a longer cycle if compensating controls are strong.
There is no universal standard for this yet, but best practice is evolving toward continuous controls instead of calendar-based ceremonies. For example, secrets that are short-lived and tied to a workload identity can sometimes be exempted from manual recertification if policy-as-code proves the token scope, TTL, and revocation path. By contrast, persistent service accounts with broad privileges, or identities used across multiple pipelines, should never rely on a single annual attestation. NHIMG reporting on the Microsoft SAS Key Breach and the Sisense breach illustrates why static access plus weak review discipline creates a long tail of exposure. Manual review is sometimes defensible for very small environments, but it becomes unreliable once entitlement volume, cloud sprawl, or contractor turnover increases.
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, OWASP Agentic AI Top 10 and CSA MAESTRO address the attack and risk surface, while NIST AI RMF 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-01 | Manual reviews often miss stale or overprivileged NHI entitlements. |
| OWASP Agentic AI Top 10 | A-05 | Ad hoc review fails when autonomous workloads hold dynamic access. |
| CSA MAESTRO | TRA-03 | Governance must track entitlement drift across autonomous and automated workflows. |
| NIST AI RMF | GOVERN | AI governance needs accountable approval and traceable review evidence. |
| NIST CSF 2.0 | PR.AA-1 | Identity proofing and access control require consistent authorization decisions. |
Inventory NHI access, then certify only identities with verified owners and current business need.
Related resources from NHI Mgmt Group
- What breaks when access requests are handled with manual approvals and permanent group membership?
- What breaks when API access for AI workflows is handled through manual registration and credential setup?
- What breaks when workflow orchestration is handled through ad hoc gateway configuration?
- What breaks when access reviews stay ad hoc instead of becoming risk aware and automated?
