Who should be accountable for access reviews in a fragmented access model?

Why This Matters for Security Teams

In a fragmented access model, access reviews fail when accountability is assumed to be centralised but enforcement is actually distributed. Each team may approve, issue, and maintain different credentials, yet the review process still needs a single standard for evidence, timing, and exception handling. That is why the question is not just who signs off, but who can prove the review was meaningful.

This matters because non-human identities often outnumber human identities and carry broad privileges, so review gaps turn into real exposure quickly. NHI Mgmt Group research shows that 97% of NHIs carry excessive privileges and only 5.7% of organisations have full visibility into their service accounts, which makes ownership clarity a control objective, not a nice-to-have. The Ultimate Guide to NHIs and the OWASP Non-Human Identity Top 10 both point to visibility and lifecycle control as core weaknesses in current practice.

In practice, many security teams encounter broken review evidence only after a misused token, stale service account, or orphaned integration has already been exploited.

How It Works in Practice

Accountability should follow the control point, but it must be anchored to an enterprise review standard. In practical terms, the team that issues or owns the access should perform the review, capture the evidence, and attest to the result, while a central identity or security function defines the minimum required fields, cadence, and escalation rules. That structure avoids the common failure mode where central governance exists on paper but local teams cannot answer who approved what, when, and why.

The review workflow should be simple enough to operate consistently across business units. A typical model includes named local owners, a shared review template, automated reminders, and a retained audit trail that records the entitlement, business purpose, last-used signal, risk rating, and disposition. Where the access model includes service accounts, API keys, certificates, or workload tokens, the reviewer should validate both the business need and the technical lifetime of the credential. The NHI Lifecycle Management Guide is useful here because review accountability should align with issuance, rotation, and offboarding responsibilities rather than being treated as a standalone task.

Current guidance from OWASP Non-Human Identity Top 10 and identity governance practice suggests that reviews work best when they are tied to actual usage telemetry and privilege scope, not just roster ownership. That means reviewers need enough context to identify dormant access, excessive privilege, and non-expiring credentials. These controls tend to break down in matrixed organisations with shared platforms and outsourced operations because no single team can produce complete evidence without a common data model and enforced approval workflow.

• Local owner: confirms business need and residual risk.
• Central governance: defines evidence standards and escalation thresholds.
• Platform or issuer team: supplies usage data, entitlement detail, and revocation proof.
• Security or audit: validates sampling, exceptions, and retention.

Common Variations and Edge Cases

Tighter review accountability often increases administrative overhead, requiring organisations to balance control quality against operational speed. That tradeoff is real, especially where access is provisioned through CI/CD pipelines, shared automation platforms, or third-party managed services. Current guidance suggests that the accountable reviewer should be the party closest to the access decision, but there is no universal standard for this yet across every operating model.

For centralised IAM, a single directory owner may be able to own the whole review cycle. In federated or product-aligned models, the accountable party is usually the domain owner who can explain the access in business terms and show evidence of use. For vendor-managed environments, accountability should remain with the internal business owner even if the vendor executes the action, because delegated execution does not transfer governance responsibility. This is especially important where NHIs are long-lived or embedded in automation, since hidden ownership often leads to stale access that looks approved but is no longer required.

The most practical rule is to separate responsibility from execution: the local team reviews, the central function standardises, and audit verifies. That division is only defensible if exceptions are tracked and expired access is removed promptly. In organisations with highly fragmented platforms, the model breaks down when entitlement records are incomplete or when no team owns the evidence repository, because then every review becomes a one-off judgment instead of a repeatable control.

Related resources from NHI Mgmt Group

• Who is accountable for access governance when systems are fragmented?
• Who is accountable for SOX control failures in IAM and access reviews?
• Who is accountable when fragmented identity data causes access failures?
• Who is accountable when offboarding reviews miss access?