Should organisations separate human and non-human access review processes for SOC 2?

Yes, because the evidence and lifecycle expectations are different even when the control objective is similar. Human accounts, service accounts, and privileged infrastructure access generate different artefacts and different revocation paths. A single review model usually hides the gaps auditors care about most.

Why This Matters for Security Teams

SOC 2 access reviews are not just a record-keeping exercise. For human users, reviewers look for employment status, role changes, and timely removal. For non-human access, the real test is whether service accounts, API keys, and workload credentials are inventoried, scoped, rotated, and revoked on a reliable lifecycle. That difference matters because the evidence trail and the revocation path are not the same.

Mixing both populations into one review process often creates false confidence. A reviewer may confirm that a person still needs access while missing a dormant token embedded in a pipeline, or approve a shared service account without seeing who owns it. Current guidance suggests separating the review motion even when the control objective stays aligned, especially for NHI-heavy environments. NHIMG research on the Ultimate Guide to NHIs notes that only 5.7% of organisations have full visibility into their service accounts, which shows how easy it is to miss what the audit trail does not surface. In practice, many security teams discover these gaps only after an auditor asks for evidence, rather than through intentional identity governance.

How It Works in Practice

The practical model is to run two related but distinct review workflows. Human access reviews usually center on RBAC alignment, manager attestation, employment status, and exception handling. Non-human access reviews should center on ownership, purpose, credential type, last rotation date, TTL, downstream dependencies, and whether the identity is a workload identity or a static secret. That distinction maps cleanly to the control intent in OWASP Non-Human Identity Top 10 and to the lifecycle focus in NHI Lifecycle Management Guide.

A strong SOC 2 process usually includes:

• A separate asset inventory for service accounts, API keys, certificates, and automation identities.
• Assigned technical owners who can attest to purpose and business need, not just nominal assignment.
• Evidence of rotation, expiration, and revocation for secrets and keys, especially where human sign-off is meaningless without machine lifecycle data.
• Compensating controls for shared or inherited access, such as vault logs, CI/CD audit logs, and workload execution logs.
• Exception handling for break-glass or legacy integrations, with a clear sunset date.

Auditors usually care less about the format of the review and more about whether the process can show who approved access, what changed, and how removal was enforced. The Lifecycle Processes for Managing NHIs research is useful here because it frames review as part of ongoing governance rather than a quarterly checkbox. These controls tend to break down when identities are embedded in code, infrastructure-as-code, or CI/CD pipelines because ownership, usage, and revocation are distributed across systems rather than visible in one console.

Common Variations and Edge Cases

Tighter review separation often increases operational overhead, requiring organisations to balance audit clarity against admin effort. That tradeoff is real, especially in smaller teams that want one approval workflow for everything. Current guidance suggests not forcing a single process just for convenience, because the evidence standards are different for humans and non-humans. A merged review can still work if the reporting clearly segments each identity class, but the review questions and remediation steps should remain distinct.

Edge cases usually appear in service accounts that look human-owned but behave like machine identities, such as shared admin accounts, vendor-managed integrations, or accounts used by both a person and an automation. These are high-risk because ownership becomes ambiguous and revocation gets delayed. Where there is no universal standard for this yet, best practice is to classify the account by dominant risk, then document why it belongs in the human or non-human review stream. For control design, the most relevant signal is whether the account can be independently rotated or revoked without waiting for a person to log off. NHIMG’s Key Challenges and Risks section highlights how excessive privilege and poor visibility compound this problem.

For SOC 2 evidence, the practical test is simple: if the reviewer cannot prove lifecycle control, then the access review is incomplete, even if the attestation sheet is signed.

Related resources from NHI Mgmt Group

• How should security teams run access reviews for non-human identities?
• How should security teams govern non-human identities that have persistent access?
• How should security teams govern non-human identities for SOC 2 compliance?
• What signals show that access review processes are becoming too manual?