Accountability should sit with a designated certification owner who oversees the review, supported by reviewers who make the access decision and security teams who enforce outcomes. Clear ownership matters because access review is not just a workflow, it is a governance control. Without explicit accountability, certifications stall, evidence quality drops, and remediation of excessive access is easily deferred.
Why This Matters for Security Teams
Access reviews only work when one person is clearly responsible for the certification outcome, not when accountability is spread across IAM, app owners, audit, and security operations. Governance programmes fail when review owners assume someone else will chase exceptions, document decisions, or remove access. That gap turns a control into paperwork. Current guidance from the NIST Cybersecurity Framework 2.0 and NHIMG’s Ultimate Guide to NHIs — Regulatory and Audit Perspectives both point to the same operational reality: accountability must be explicit, documented, and enforceable.
In practice, access reviews are where excessive access is either found and removed or quietly preserved because no one owns the follow-through. The certification owner is accountable for running the review end to end, while reviewers are accountable for making an informed decision on each entitlement and security teams are accountable for implementing technical enforcement. That distinction matters because the control is only as strong as the evidence trail behind it, including approvals, exceptions, escalations, and remediation dates. In many organisations, the failure is not missing reviewers but unclear ownership after the first reminder cycle.
How It Works in Practice
A workable governance model assigns one certification owner per review campaign. That owner is responsible for launching the review, ensuring the correct population is in scope, tracking completion, escalating non-response, and retaining evidence. Reviewers, usually application owners or data owners, decide whether access is still justified. Security, IAM, or PAM teams enforce removals, time-bound exceptions, and compensating controls. This separation keeps the control auditable and prevents the review from collapsing into an informal conversation.
For NHI-related access, the same principle applies to service accounts, API keys, OAuth grants, and automation identities. NHIMG’s Top 10 NHI Issues and NHI Lifecycle Management Guide reinforce that lifecycle ownership must include review, not just issuance and rotation. Practically, teams should document:
- Who owns certification completion for each system or business unit
- Who has decision authority for approving or revoking access
- Who implements removals and validates closure
- What evidence is retained for audit and exception handling
Controls work best when review tasks are linked to authoritative identity inventories and ticketing evidence, with due dates and escalation paths attached to every certification. For formal control design, the NIST SP 800-53 Rev 5 Security and Privacy Controls is useful for mapping access review obligations to reviewable control language, while the OWASP Non-Human Identity Top 10 helps teams connect governance to identity-specific risks. These controls tend to break down when review ownership is assigned to a role that lacks authority over the application or when remediation is left outside the certification workflow.
Common Variations and Edge Cases
Tighter certification ownership often increases coordination overhead, requiring organisations to balance auditability against speed and reviewer fatigue. That tradeoff becomes most visible in large enterprises, federated business units, and environments with many service accounts or delegated admin paths. Best practice is evolving, but current guidance suggests that the owner should be the person or function best positioned to answer for the control outcome, not necessarily the person performing the mechanical approval.
There are a few common edge cases. In shared platforms, the platform owner may run the campaign while domain owners approve access. In outsourced or SaaS environments, the business owner may need to certify access while a central security team validates evidence and enforces removals. For NHIs, certifications may need to account for machine-to-machine relationships, secret sprawl, and non-interactive access that is easy to overlook in human-centric reviews. NHIMG’s Ultimate Guide to NHIs and 52 NHI Breaches Analysis show why governance fails when ownership is ambiguous and review evidence is incomplete.
Where organisations struggle most is the handoff from decision to enforcement. If the reviewer can approve but nobody is clearly accountable for revocation, remediation drifts and exceptions become permanent. In mixed human and non-human environments, that is usually when the control stops being a governance mechanism and starts being an audit finding waiting to happen.
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 and CSA MAESTRO 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.AA | Access reviews support identity and access governance accountability. |
| NIST SP 800-53 Rev 5 | AC-2 | Accountability for account review and removal maps directly to account management. |
| OWASP Non-Human Identity Top 10 | NHI-01 | NHI governance requires clear ownership of machine identity lifecycle decisions. |
| NIST AI RMF | AI RMF emphasises governance and accountability for automated systems. | |
| CSA MAESTRO | Agentic governance needs explicit responsibility for review and enforcement. |
Define accountable owners for access review decisions and evidence retention across automated identities.
Related resources from NHI Mgmt Group
- Who is accountable for completing access reviews and preserving evidence for audit purposes?
- Who should be accountable for completing and evidencing SaaS access reviews?
- Who should be accountable for access governance when enterprises use a partner to implement identity controls?
- Who is accountable when workflow access reviews and source-of-truth decisions are inconsistent?
