Start by enumerating every identity type that can hold access, including service accounts, applications, third parties, and devices. Then compare that inventory to the population actually covered by access reviews, offboarding, and logging. If the audit only certifies humans, it is not testing the real access surface.
What IAM Teams Should Do First
The first move is scope correction, not remediation. Build an identity inventory that includes every actor type that can hold access, then compare it to the population actually covered by reviews, offboarding, and logging. That tells you whether the audit is measuring the real access surface or only the human slice of it.
For non-human identities, the inventory has to be specific enough to distinguish service accounts, application identities, third-party integrations, devices, and shared technical accounts. If those are not separately visible, you cannot reliably tell whether ownership, lifecycle controls, or privilege review are missing.
Use the inventory as the baseline, then map each identity type to its governing control path. If a class of access is outside certification, offboarding, or event coverage, treat that as a control gap rather than a documentation issue.
Why Missing Non-Human Identities Distort the Audit Result
An audit that only certifies human users can still look clean while leaving machine-to-machine access unchecked. That creates a false sense of control because the highest-risk access paths are often the least visible ones, especially where credentials are shared, long-lived, or tied to integrations that rarely get reviewed.
The practical problem is coverage, not theory. If access reviews never include technical identities, the organisation may have no evidence for who owns them, why they exist, whether they still need access, or whether their privileges match current business need.
That is why a full population inventory matters before any control testing. Ultimate Guide to NHIs is useful here because it frames discovery, lifecycle, visibility, and offboarding as part of the same control problem, not separate exercises.
How to Rebuild Scope So the Control Test Is Real
Start with classification. Separate humans from non-humans and then separate non-human types from one another, because the right owner, authentication method, and review cadence can differ materially across service accounts, apps, APIs, and devices.
Next, compare that inventory to three evidence sources: access recertifications, offboarding records, and logging coverage. Gaps usually show up in one of three ways: identities that exist but are never reviewed, identities that were never assigned an owner, or identities that still authenticate after the business process they supported has changed.
When the inventory is mature enough, NHI Lifecycle Management Guide and Service Account Security Guide both support the next step: converting a one-time discovery exercise into an ongoing review and offboarding process.
Risk and Threat Considerations
When non-human identities are absent from audit scope, the real exposure is blind privilege. Attackers and internal abuse do not need a human account if unattended service credentials, stale integrations, or overprivileged technical accounts can still reach production systems.
Failure mechanism: The organisation certifies the visible human population while leaving machine and application access outside review, so excess privilege, orphaned accounts, and stale credentials persist unnoticed.
Impact: Access can remain active after ownership changes, deprovisioning, or role changes, which increases the blast radius of compromise and weakens attribution when activity originates from a non-human account.
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 addresses the attack surface, NIST SP 800-53 Rev 5 and CSA Cloud Controls Matrix set the technical controls, and ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Non-human identities depend on credential lifecycle control and rotation. |
| AU-2 — Audit Events | The question centers on whether logging covers the full access population. | |
| AC-2 — Account Management | Missing NHI scope is an account lifecycle and inventory gap. | |
| Recommendation — Inventory all authenticators and enforce rotation, expiration, and revocation for technical identities. Ensure audit events cover both human and non-human access paths. Maintain complete account inventories and review non-human accounts in the same lifecycle process. | ||
| ISO/IEC 27001:2022 | A.5.16 — Identity management | Scope correction requires a complete identity inventory across human and non-human actors. |
| A.5.18 — Access rights | The issue is whether access reviews and offboarding cover all identities. | |
| Recommendation — Define and maintain identity records for every access-bearing actor. Review and revoke access rights across the full identity population. | ||
| OWASP Non-Human Identity Top 10 | NHI-01 — Improper Offboarding | Missing NHI scope commonly leaves technical identities active after need ends. |
| NHI-05 — Overprivileged NHI | Unscoped technical identities can retain excess access outside audit coverage. | |
| NHI-10 — Human Use of NHI | Audit scope often fails when people borrow technical identities informally. | |
| Recommendation — Offboard non-human identities with the same rigor used for human accounts. Reduce non-human privileges to the minimum required for each use case. Detect and eliminate human use of non-human credentials and accounts. | ||
| CSA Cloud Controls Matrix | IAM — Identity and Access Management | Cloud control coverage must include non-human identities and their review scope. |
| Recommendation — Extend cloud IAM governance to all identity types and access paths. | ||
Practitioner Guidance
What to prioritise: Fix population coverage before tuning review quality. If the audit universe does not include non-human identities, no amount of sampling rigor will make the control trustworthy.
What to verify: Confirm that every identity class with authentication capability appears in the inventory and that each class maps to an owner, a lifecycle path, and a logging source. If one of those three is missing, the control design is incomplete.
Decision rule: If the current certification process cannot include service accounts, applications, third parties, and devices, treat the audit as incomplete and reopen scope rather than accepting a “pass” on human coverage alone.
Practitioner takeaway: The first correction is always visibility of the full access population, because you cannot govern access you have not counted.