IAM teams should distribute certification workload across multiple reviewers when campaigns regularly stall, but they must keep final ownership and escalation rules explicit. The goal is to shorten approval queues without making accountability ambiguous. If reviewer assignment is unclear, faster completion can still produce weak governance evidence.
Why This Matters for Security Teams
access review campaigns bottleneck when reviewers are overloaded, but the deeper risk is governance drift: certifications that are delayed, skipped, or rubber-stamped stop being useful evidence of control. For NHIs and agentic workloads, slow reviews are especially dangerous because access often maps to secrets, API keys, and service tokens that can be abused long before the next campaign closes. That makes reviewer capacity a security issue, not just an operations issue. The OWASP Non-Human Identity Top 10 reinforces that unmanaged identities and weak lifecycle controls create recurring exposure, while NHI governance guidance from Ultimate Guide to NHIs treats lifecycle ownership as a control, not an admin task. In practice, many security teams discover review bottlenecks only after overdue attestations and unclear exception handling have already weakened the audit trail.
How It Works in Practice
Reducing bottlenecks starts with segmenting the campaign by accountability, not by convenience. High-volume entitlements should be split across multiple reviewers with explicit scope, while final disposition remains with the named owner or delegated approver. That means access review tooling should support reviewer routing, escalation timers, and clear fallback rules when a reviewer is absent. The goal is to compress queue time without turning certification into a distributed guess.
Practitioners usually get better results when they separate reviews into categories:
- Business ownership for application and data access
- Technical ownership for service accounts, secrets, and integrations
- Security oversight for exceptions, elevated access, and unresolved items
That structure matters because NHIs and automation identities often do not behave like human users. A token or service account may have many more effective permissions than its visible assignment suggests, so reviewer context must include actual use, not just directory metadata. The NHI Lifecycle Management Guide is useful here because it frames ownership, rotation, and deprovisioning as linked controls rather than separate workflows. For broader alignment, NIST’s guidance on access governance in the Zero Trust Architecture model supports continuous verification, and that same logic applies to recurring review evidence.
Campaign design also matters. Keep review waves short, use pre-populated risk context, and flag only exceptions that need human judgment. When the reviewer has to infer purpose from raw entitlements, the queue slows and decisions get weaker. These controls tend to break down when entitlement data is fragmented across multiple IAM, PAM, and secrets platforms because reviewers cannot reliably see what the access is actually used for.
Common Variations and Edge Cases
Tighter review routing often increases coordination overhead, so organisations have to balance faster completion against reviewer fatigue and inconsistent judgement. For mature programmes, the best practice is evolving toward risk-based attestation: low-risk, repetitive entitlements can be reviewed in bulk, while privileged, shared, or dormant NHIs get a narrower approval path. That reduces noise without lowering the standard for high-impact access.
A common edge case is the “shared owner” problem. If two teams both believe they own the same service account or integration, a campaign can finish quickly yet still produce weak evidence. Another is emergency access that expires before the review cycle even begins. In those cases, the review process should record why access existed, who approved it, and when it was revoked, rather than treating the campaign as a simple yes or no event.
Current guidance suggests that automation should assist reviewer assignment, but not silently reassign accountability. The 52 NHI Breaches Analysis shows why that distinction matters: weak ownership and lifecycle gaps repeatedly show up in compromise paths. For control design, the OWASP Non-Human Identity Top 10 is a good reference point, but there is no universal standard for exactly how many reviewers a campaign should use. The right answer depends on entitlement volume, privilege level, and whether access is human or machine-driven.
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 Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Review bottlenecks often hide unclear NHI ownership and entitlement scope. |
| NIST CSF 2.0 | PR.AA-01 | Access review campaigns support access governance and authorization decisions. |
| NIST Zero Trust (SP 800-207) | PR.AC-4 | Continuous verification aligns with faster, risk-based access attestation. |
Keep access decisions tied to current context instead of relying on static annual reviews.
Related resources from NHI Mgmt Group
- How should security teams reduce the impact of DNS hijacking on identity and access paths?
- How should IAM teams respond when Office 365 identity sprawl spans human and non-human access?
- How should security teams reduce cloud identity risk without overcomplicating access management?
- How should security teams reduce identity silos across IAM, ITDR, and NHI tooling?
