Treat both as governed identity lifecycles with the same evidence expectations. Human users, contractors, service accounts, and applications all need approval records, review cadence, and revocation proof if they are part of the certified ISMS. The exact workflow may differ, but the accountability model should not.
How ISO 27001 should treat human and non-human access as one governance model
ISO 27001 works best when teams stop separating “user access” from “service access” in policy terms and instead govern both as controlled identities inside the same ISMS. The practical difference is in workflow and evidence, not accountability. That means access approval, periodic review, and revocation evidence should be consistently demonstrable whether the subject is a person, contractor, service account, or application.
For the certification boundary, the question is not whether the actor is human, but whether it has access that can affect confidentiality, integrity, or availability. If it does, it needs an owner, a lifecycle, and records that show who approved it, who reviewed it, and how it was removed when no longer needed. That is where ISO/IEC 27001:2022 Information Security Management matters most in practice.
This alignment also helps teams avoid a common audit weakness: treating service accounts as technical exceptions with lighter governance than people. In an ISMS, exceptions still need justification, compensating controls, and traceable review. If the control objective is “only authorised access exists,” then the evidence standard should be consistent across identities even when the provisioning path differs.
Why the evidence model should be the same even when the workflow is different
Human access and non-human access often use different mechanics, but ISO 27001 cares about the governance outcome. A human may be approved through HR and manager sign-off, while a service account may be approved through an application owner or system owner. What should not differ is the ability to show that access was intentionally granted, periodically revalidated, and removed when the business need ended. The strongest way to keep this aligned is to map both to a common control narrative and reference model, such as the ISO/IEC 27002:2022 Information Security Controls guidance for selecting and implementing controls.
For practitioners, the key implication is that workflows may be environment-specific, but evidence collection should not be. If the ISMS expects review cadence, approval authority, and revocation proof for one class of identity, the same evidence pattern should exist for the others. Otherwise the organisation may appear compliant on paper while leaving unmanaged accounts, orphaned services, or stale application credentials outside the same governance discipline.
That is also why a regulatory mapping view can be useful. Teams often need to show that identity controls are not being invented ad hoc for one audit, but are part of a broader compliance model that already covers ISO 27001 and adjacent obligations. A resource like the Identity Security Regulatory Map helps teams connect identity controls to the wider control environment without changing the underlying ISMS logic.
How to make access reviews, revocation, and ownership auditable at scale
The cleanest implementation pattern is to treat all access as lifecycle-managed, then tailor the operational steps by identity type. For humans, that often means joiner-mover-leaver processes and manager or system-owner review. For non-human identities, it means ownership at creation, documented purpose, expiry or rotation expectations, and a reliable revocation path when the system is retired or the integration changes. ISO 27001 becomes much easier to evidence when the record set answers the same questions for every identity class: who owns it, why does it exist, who approved it, when was it last reviewed, and how is it removed?
Practitioners should also be explicit about shared responsibilities. Security teams can define the control pattern, but application owners, platform teams, and business owners must supply the operational truth about what access is still needed. If ownership is unclear, the review is usually cosmetic. If revocation cannot be shown, the control is incomplete regardless of whether the access belonged to a person or a service.
For teams handling many technical identities, the service-account side of the problem is often where evidence breaks down first. A useful internal reference is the Service Account Security Guide, which reinforces discovery, least privilege, rotation, and governance as the practical foundations of auditable service access. The broader non-human identity lifecycle view in the Ultimate Guide to NHIs, What are Non-Human Identities is also useful when teams need a shared vocabulary across IAM, operations, and audit.
Risk and Threat Considerations
When human and non-human access are governed differently, the usual failure mode is blind spots, not just bad paperwork. Stale service accounts, orphaned application credentials, and weak revocation processes create standing access that can survive team changes, vendor changes, or system retirement. That increases the chance of unauthorized access, audit findings, and downstream compromise if an unused credential is discovered or reused.
Failure mechanism: The organisation proves review and approval for people, but not for technical identities, so the ISMS control is only partially operating and access can persist without meaningful challenge.
Impact: The business inherits hidden privilege, weaker accountability, and a larger attack surface, especially where an application or service account can reach production systems or sensitive data.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5 sets the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| ISO/IEC 27001:2022 | A.5.15 — Access Control | ISO 27001 access governance underpins approval, review, and revocation for all identity types. |
| A.5.16 — Identity Management | The question is about aligning human and non-human access processes as managed identities. | |
| A.5.18 — Access Rights | Access rights need periodic review and revocation proof for both human and non-human accounts. | |
| Recommendation — Apply A.5.15 to enforce consistent access approval, review, and removal evidence across identities. Use A.5.16 to define, own, and track every identity in the ISMS lifecycle. Use A.5.18 to review, adjust, and revoke access rights on a scheduled basis. | ||
| NIST SP 800-53 Rev 5 | AC-2 — Account Management | Account lifecycle management maps directly to human and technical access review and revocation. |
| IA-5 — Authenticator Management | Service accounts and applications still rely on credentials whose lifecycle must be governed. | |
| Recommendation — Implement AC-2 to manage account creation, review, disablement, and removal consistently. Apply IA-5 to control credential issuance, rotation, and revocation evidence. | ||
Practitioner Guidance
What to prioritise: Build one evidence model for all identities, then allow the workflow to vary by actor type. The first test is whether an auditor can ask the same four questions for a human, contractor, service account, or application and receive complete records without special-case explanations.
What to verify: Check that every access grant has an owner, a business justification, a review date, and a revocation path. If any technical identity cannot be tied to a responsible owner or cannot be removed cleanly, treat that as a control gap, not an operations detail.
Common mistake: Teams often over-focus on provisioning controls and under-invest in removal evidence. ISO 27001 findings frequently come from what happens after access is no longer needed, especially for accounts that were created for integration work and then forgotten.
Practitioner takeaway: The goal is not identical workflows for humans and machines, but identical governance expectations. If the ISMS can prove approval, review, and revocation for one, it should be able to prove them for both.
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Reviewed and updated by the NHIMG editorial team on October 8, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org