It adds the most value when access is privileged, sensitive, or subject to segregation-of-duties requirements. It is also useful when auditors expect evidence that distinct parties agreed before access remained in place. In low-risk access, the added workflow may not justify the overhead.
Why This Matters for Security Teams
Multi-level review adds real value when the access decision itself is high impact: privileged admin roles, production data, regulated systems, or any entitlement where one approver should not be able to unilaterally grant and retain access. It is also useful when the organisation needs a defensible trail that shows separation of duties was actually enforced, not just documented. Current guidance from the NIST Cybersecurity Framework 2.0 and Ultimate Guide to NHIs — Regulatory and Audit Perspectives points to governance controls being strongest when they map to risk, impact, and accountability rather than generic process checks. That matters because review workflows can either reduce excess access or simply create a delay layer that nobody trusts. For NHIs, this is especially relevant when secrets, service accounts, or OAuth grants are tied to business-critical pipelines; review helps surface ownership gaps and privilege creep before they become incident response issues. In practice, many security teams encounter weak review value only after an audit finding or a compromised credential has already exposed the control gap.
How It Works in Practice
Multi-level review works best as a policy gate, not as a ceremonial approval chain. The first reviewer should verify business need and ownership, while the second should challenge privilege scope, segregation-of-duties conflicts, and duration. For NHIs, that usually means checking whether the account is tied to a real workload, whether the access is still needed for the current task, and whether the granted scope matches the minimum required permissions. The Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs is most useful here because review should be linked to lifecycle state, not treated as a one-time onboarding event.
A practical review flow usually includes:
- Requester justification tied to a named system, workload, or change ticket.
- Primary approval from the system owner or app owner.
- Secondary approval from IAM, security, or a control owner for privileged or sensitive entitlements.
- Time bounds, so approvals expire if the access case is not renewed.
- Evidence capture, so auditors can see who approved what, when, and why.
That structure aligns with NIST SP 800-53 Rev 5 Security and Privacy Controls, especially where access authorisation and accountability are required. It also helps address the NHI security gap highlighted in The State of Non-Human Identity Security, where lack of rotation and over-privilege are common attack drivers. These controls tend to break down when approvals are routed through too many teams for low-risk access, because the queue becomes the control and owners start rubber-stamping just to keep work moving.
Common Variations and Edge Cases
Tighter review often increases cycle time and approval fatigue, so organisations have to balance stronger assurance against operational delay. Best practice is evolving toward risk-based review depth rather than forcing every entitlement through the same path. For example, low-risk read-only access may only need a single owner approval, while production write access, break-glass use, or access to financial systems may justify two independent reviewers. The key is to reserve multi-level review for situations where the second approver changes the risk outcome, not merely the paperwork volume.
There are a few important edge cases. Emergency access may need post-approval review instead of pre-approval to avoid blocking incident response. For service accounts and other NHIs, reviewer assignment can be difficult because the “owner” is often unclear; that is where Top 10 NHI Issues is a useful reference for common governance failures, especially ownership ambiguity and stale access. If the control is used to satisfy audit expectations, the approval chain must be consistent and measurable; otherwise, evidence quality collapses even if the workflow looks robust. In short, multi-level review adds the most value when it prevents privileged access from surviving beyond its justified use case, but it creates diminishing returns when applied uniformly to low-impact requests.—
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, NIST SP 800-53 Rev 5 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-4 | Multi-party approval strengthens access enforcement for privileged and sensitive entitlements. |
| NIST SP 800-53 Rev 5 | AC-6 | Least privilege is the main reason to add a second reviewer for high-risk access. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Review helps prevent stale or excessive non-human access from persisting unnoticed. |
| NIST AI RMF | Risk-based governance aligns with AI RMF principles for accountability and impact. |
Require approval checks that least privilege and SoD remain intact before access is granted or extended.
Related resources from NHI Mgmt Group
- When does multi-level access review add value, and when does it become overhead?
- What is the difference between human IAM controls and NHI governance?
- What does the 144:1 NHI-to-human ratio mean for IAM governance programmes?
- How should IAM teams identify where SailPoint governance stops and manual control starts?
