Service accounts, API keys, and tokens often carry access that can bypass the visibility and review patterns built for humans. If they are missing from the control inventory, the SOC 2 evidence story is incomplete. Auditors may see a strong human access process while the real operational risk sits in unattended machine credentials.
Why This Matters for Security Teams
SOC 2 testing is designed to show that access is controlled, reviewed, and evidence-backed. Non-human identities such as service accounts, API keys, and automation tokens complicate that story because they often sit outside human joiner-mover-leaver workflows, yet they can reach production data and administrative functions. The control question is not just who approved access, but whether machine identities are inventoried, scoped, rotated, and revoked with the same discipline. NHI Mgmt Group’s Ultimate Guide to NHIs — Regulatory and Audit Perspectives frames this as a visibility problem as much as a governance problem.
That distinction matters because auditors do not only assess policy existence. They look for operational consistency, evidence of review, and traceability across the full identity surface. A program can have strong human access reviews and still fail to explain where long-lived secrets live, how they are rotated, or who owns them. The NIST Cybersecurity Framework 2.0 reinforces the need for inventory, governance, and ongoing control validation across all assets, including credentials that are not tied to a person. In practice, many security teams encounter NHI exceptions only after an audit request exposes missing evidence, rather than through intentional control design.
How It Works in Practice
For SOC 2, non-human identities should be treated as scoped assets with named owners, defined purpose, and evidence of lifecycle control. That means building an inventory of service accounts, tokens, keys, and certificates; mapping each to a business function; and showing that secrets are issued, stored, rotated, and revoked according to policy. The operational question is whether the organisation can prove control over each machine identity, not whether a credential merely exists. NHI Mgmt Group’s Top 10 NHI Issues is useful here because it highlights the recurring failures auditors tend to uncover.
Practitioners usually need evidence in four areas:
- Inventory: a complete list of non-human identities, owners, and systems that use them.
- Access scope: documented least-privilege permissions and the business need for each credential.
- Rotation and revocation: proof that secrets are rotated on schedule and removed when no longer needed.
- Monitoring: logs that show use, anomalies, and administrative changes to the identity itself.
Current guidance suggests pairing that evidence with secret management controls, change records, and periodic attestations from system owners. The point is not to mirror human access reviews mechanically; it is to create a defensible audit trail for credentials that operate continuously and often outlive the application team that created them. Where the environment is highly automated, ephemeral, or developer-owned, these controls tend to break down because ownership is diffuse and credentials are embedded in CI/CD pipelines or code paths.
Common Variations and Edge Cases
Tighter control over non-human identities often increases operational overhead, requiring organisations to balance auditability against deployment speed. That tradeoff is especially visible in environments that rely on service-to-service authentication, legacy batch jobs, or third-party integrations. In those cases, best practice is evolving, and there is no universal standard for exactly how much evidence SOC 2 auditors will require for every credential type. The common expectation is still clear: the organisation must show that the risk is known, assigned, and managed.
Some teams overfocus on vault usage and miss the broader control story. A vault can reduce secret sprawl, but it does not by itself prove inventory completeness, owner accountability, or timely offboarding. Others assume that short-lived tokens eliminate audit concerns, when the real issue is whether token issuance, scope, and revocation are governed. NHI Mgmt Group’s Ultimate Guide to NHIs — Key Challenges and Risks is a strong reference for these gaps, especially where excessive privilege or secret sprawl weakens the evidence chain. The practical standard is simple: if a machine credential can access production, it belongs in the SOC 2 control narrative and the supporting test evidence.
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 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | ID.AM-1 | NHI inventories are essential for proving machine credential scope in audits. |
| NIST CSF 2.0 | PR.AA-1 | SOC 2 evidence depends on controlling authentication for non-human identities. |
| OWASP Non-Human Identity Top 10 | NHI-01 | Covers missing inventory and governance for non-human identities. |
Document how service accounts and tokens are authenticated and approved for use.
