Manual access reviews fail because reviewers receive fragmented snapshots, not a complete access story. In hybrid IAM programmes, entitlements change across many systems at different speeds, so stale exports, missing context, and reviewer fatigue all increase the chance of rubber-stamped approvals and lingering privilege.
Why Manual Access Reviews Break Down in Hybrid IAM Programmes
Manual reviews fail when reviewers are asked to judge access from partial exports instead of a live, contextual picture. In hybrid iam programmes, access is split across SaaS, cloud, on-premises, and NHI-driven workloads, so entitlement drift happens faster than review cycles can catch up. The result is predictable: stale evidence, inconsistent approvals, and a false sense of control that looks compliant on paper but misses privilege accumulation in practice.
That gap is especially visible when non-human identities are involved. NHIMG research shows that 88.5% of organisations say their non-human IAM practices lag behind or are merely on par with human IAM efforts in the 2024 Non-Human Identity Security Report. That is not just a maturity issue. It means reviewers are often evaluating identities they do not fully understand, against systems they cannot see in one place. The OWASP Non-Human Identity Top 10 reflects the same operational reality: hidden secrets, excess permissions, and weak lifecycle controls tend to survive manual oversight.
In practice, many security teams discover review failure only after an access path has already been used, rather than through intentional review design.
How Manual Review Processes Fail in Practice
Hybrid IAM review workflows usually depend on exports from multiple sources, then rely on managers or app owners to validate what they see. The problem is that those snapshots are already outdated by the time the review starts. A person may approve access because the entitlement looks legitimate in isolation, even though it is no longer needed, inherited from a role change, or duplicated through a service account.
In NHI-heavy environments, the issue gets worse because the reviewer is not validating a human login but a workload, token, API key, or certificate whose purpose is often invisible in a spreadsheet. Current guidance suggests tying reviews to workload identity and actual usage context, not just the presence of an entitlement. That aligns with the broader control direction in the Ultimate Guide to NHIs, which treats lifecycle visibility as the foundation for meaningful access decisions.
- Use authoritative sources for entitlements, not manually merged exports.
- Include last-used data, ownership, and business purpose for each access path.
- Separate human review logic from workload and secret review logic.
- Escalate exceptions automatically when reviewers cannot validate necessity.
Manual review also breaks down when access is technically valid but operationally unsafe, such as long-lived secrets shared across pipelines or service accounts with no clear owner. These controls tend to break down when entitlements span multiple directories, clouds, and SaaS systems because no single reviewer can reconstruct the real access chain quickly enough.
Where Better Governance Needs to Evolve
Tighter review requirements often increase operational overhead, requiring organisations to balance assurance against speed and reviewer fatigue. That tradeoff is real, especially in hybrid estates where one approval may affect both human and machine access. Best practice is evolving toward continuous, event-driven review rather than periodic spreadsheet sign-off, but there is no universal standard for this yet.
For practical improvement, teams should move toward automated evidence collection, ownership metadata, and policy-based decisioning at the point of access. The 52 NHI Breaches Analysis shows why this matters: recurring failures are rarely about one bad approval and more often about weak lifecycle governance that lets excessive access persist. The same pattern appears in the DeepSeek breach, where exposure and secret handling failures demonstrate how quickly unmanaged access becomes operational risk. Security teams should also anchor review design to the OWASP Non-Human Identity Top 10 so that secrets, rotation, and privilege boundaries are reviewed as a system, not as isolated tickets.
Manual access reviews still have a role for exceptions and high-risk attestations, but they should not be the primary control for fast-moving hybrid environments.
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 miss hidden NHI sprawl and secret-driven access paths. |
| NIST CSF 2.0 | PR.AC-4 | Access review failures stem from weak least-privilege validation across systems. |
| NIST AI RMF | Governance must account for dynamic AI and workload access decisions. |
Use AI RMF governance to define accountability, monitoring, and escalation for autonomous access.
