Manual reviews break when reviewers cannot validate current business context quickly enough to identify toxic access, orphaned accounts, or stale approvals. The result is not just inefficiency, but false confidence, because the certification may be completed after the access has already become inappropriate. The control exists on paper, not in practice.
Why This Matters for Security Teams
Manual access reviews are designed to catch excess entitlement before it becomes an incident, but in practice they often lag the environment they are meant to govern. That gap matters because identity sprawl is already severe: NHI Mgmt Group reports that NHIs outnumber human identities by 25x to 50x in modern enterprises, and 97% of NHIs carry excessive privileges in its Ultimate Guide to NHIs. When certifiers are validating stale spreadsheets instead of live context, they miss orphaned accounts, hidden dependencies, and approvals that no longer match business reality.
The operational risk is not limited to audit failure. Manual reviews can also preserve access that should have been removed days or weeks earlier, especially where service accounts, API keys, and delegated automations change faster than quarterly attestation cycles. OWASP’s OWASP Non-Human Identity Top 10 reinforces the point that unmanaged non-human credentials are a persistent attack path, not a paperwork issue. In practice, many security teams discover access-review gaps only after a privilege escalation or breach has already exposed the mismatch between recordkeeping and reality.
How It Works in Practice
Manual reviews fail because they depend on people to interpret entitlement data without enough current context. A reviewer may see that an account is approved, but not whether the workload is still active, whether the owning team changed, whether the secret was copied into another pipeline, or whether the privilege is now toxic because of a new dependency. Current guidance suggests pairing certification with runtime signals, because static review alone cannot keep pace with ephemeral workloads, rotating credentials, and automated tool chaining.
Effective programs increasingly combine access review with inventory, ownership, and lifecycle evidence. That means validating what the identity is, what it can reach, and whether it is still needed. The NHI Lifecycle Management Guide is useful here because manual approval without lifecycle offboarding often leaves stale access in place long after business use has ended.
- Use live asset and identity inventory before certification begins, not after it ends.
- Require explicit business ownership for each NHI, service account, or token.
- Cross-check last use, privilege scope, rotation age, and downstream dependencies.
- Automate revocation for obviously stale or unowned access, then route exceptions for human review.
- Feed review outcomes back into provisioning, rotation, and offboarding workflows.
Where manual reviews are kept, they should be targeted at exceptions and high-risk access rather than treated as the primary control. The industry is not fully aligned on the exact threshold for automation, but best practice is evolving toward continuous or near-continuous verification for NHIs and privileged access. These controls tend to break down when entitlements are spread across CI/CD systems, cloud roles, and legacy directories because no single reviewer can reconstruct the true access path fast enough.
Common Variations and Edge Cases
Tighter access review often increases operational overhead, requiring organisations to balance assurance against reviewer fatigue and business disruption. That tradeoff becomes sharper in environments with short-lived workloads, multi-cloud estates, or high-volume API ecosystems, where a manual certification window can expire before the reviewer has finished tracing ownership and usage.
There is no universal standard for this yet, but current guidance suggests treating manual review as one layer in a broader control set, not as proof of least privilege. This is especially important where access is inherited through groups, role templates, or delegated automation, because the apparent entitlement may not match effective privilege. NHI Mgmt Group’s research on 52 NHI Breaches Analysis shows how often compromised or overexposed NHIs become part of broader incident chains.
In highly regulated teams, manual reviews may still be required for evidence, but they should be backed by deterministic signals such as last-seen activity, rotation status, and policy violations. Where those signals are missing, the review process becomes a compliance ritual rather than a security control. The weakest point is always the environment where identity data is fragmented across tools and the reviewer must guess which record is authoritative.
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-01 | Manual reviews fail when NHI ownership and privilege data are incomplete or stale. |
| NIST CSF 2.0 | PR.AC-4 | Manual certifications often miss whether access is still appropriate and least-privileged. |
| NIST AI RMF | AI RMF highlights governance gaps when controls lag changing operational context. |
Use governance processes that verify current context, not just periodic approval records.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 24, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
