Use multi-level review only for access where a wrong approval would create material risk, such as admin roles, regulated data, or systems under audit. Keep the chain short, usually two or three levels, and make each reviewer independent. Sequence the reviews so each level sees prior decisions, and require comments on modify or revoke decisions to preserve a usable audit trail.
Why This Matters for Security Teams
Multi-level review is most useful when access decisions carry disproportionate downside, such as privileged SaaS administration, payment workflows, or regulated records. The issue is not just who can approve access, but whether approvals are independent enough to catch mistakes, overreach, or policy drift. NHI Management Group research shows that 97% of NHIs carry excessive privileges, which is a reminder that access sprawl is usually the default unless review gates are intentionally designed. See the Ultimate Guide to NHIs and the OWASP Non-Human Identity Top 10 for the broader context behind privilege accumulation and control failure.
Security teams often get this wrong by applying the same review path to every request, which creates fatigue without meaningfully reducing risk. A better model is to reserve multi-level review for material-impact access and keep lower-risk access on simpler workflows. Independence matters more than hierarchy: each reviewer should assess the request on its own merits, not rubber-stamp a prior approval. In practice, many teams discover their review process is ceremonial only after an audit exception, entitlement dispute, or finance incident has already exposed the gap.
How It Works in Practice
Effective multi-level review starts with a tight scoping rule. Only high-impact access should enter the chain, such as SaaS tenant administrators, ERP superusers, payment approvers, or systems tied to segregation-of-duties rules. Align the workflow to control intent in NIST SP 800-53 Rev 5 Security and Privacy Controls, especially where access approval, separation of duties, and auditability overlap. The best practice is evolving, but current guidance suggests keeping the chain short, usually two or three reviewers, so the process remains timely and the audit trail remains readable.
A practical implementation usually includes:
- A first-line manager or application owner who validates business need.
- A second reviewer from security, risk, or the system control owner who checks privilege level and policy fit.
- A third reviewer only for exceptional cases, such as regulated data, treasury, or externally auditable systems.
- Required comments for approve, modify, or revoke decisions so the record explains the final outcome.
- Sequenced review routing so later approvers can see earlier decisions and challenge them when necessary.
Where possible, automate evidence capture: who requested access, why it was needed, what was approved, what was changed, and when it expires. That makes reviews defensible during audit and also supports periodic recertification. For identity hygiene, pair the review chain with lifecycle controls from the NHI Lifecycle Management Guide, especially when service accounts, API keys, or privileged integrations are part of the same control surface. These controls tend to break down when approvals are routed through shared inboxes or when the same person can approve multiple levels because independence disappears.
Common Variations and Edge Cases
Tighter review chains often increase cycle time and operational overhead, requiring organisations to balance stronger assurance against slower access delivery. That tradeoff becomes sharper in finance and SaaS environments where urgent changes are common, but overuse of emergency approval paths can quietly defeat the control. For that reason, current guidance suggests defining explicit break-glass handling, separate from standard multi-level review, with time limits and post-event attestation.
There is no universal standard for exactly how many review levels are enough. Two levels are often sufficient when the asset is stable and the role is narrowly defined; three may be justified when the system is regulated, high-value, or subject to audit scrutiny. Over-reliance on titles is a common failure mode, because seniority does not guarantee independence. A finance system may also need review from both a business owner and a control owner, while a SaaS admin path may require security plus platform governance. For access governance patterns and breach context, the 52 NHI Breaches Analysis is useful background, and NIST SP 800-63 Digital Identity Guidelines helps frame identity assurance, even when the reviewers are human. The process becomes fragile when organisations try to enforce multi-level review on low-risk access, because the queue grows faster than reviewers can meaningfully assess it.
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 800-63, NIST AI RMF and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-4 | Access authorisation and privilege review map directly to least-privilege governance. |
| NIST SP 800-63 | IAL2 | Identity assurance supports trustworthy approval chains for sensitive access. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Privilege sprawl and weak review are common drivers of non-human identity risk. |
| NIST AI RMF | Governance and accountability principles support auditable access decisions. | |
| NIST Zero Trust (SP 800-207) | Zero trust reinforces continuous verification for high-impact access decisions. |
Define accountable owners, review criteria, and escalation paths for every privileged access workflow.
Related resources from NHI Mgmt Group
- How should security teams implement phishing-resistant MFA for privileged SaaS access?
- How should security teams implement cloud user access reviews across SaaS and multi-cloud environments?
- How should security teams implement tenant-level key isolation in multi-tenant SaaS?
- How should security teams implement task-scoped access for multi-agent systems?
