Should organisations treat NHIs differently from human users in IAM?

Why NHIs Should Be Governed Like Identities, Not Just Assets

NHIs should not be treated as background infrastructure because they are the mechanism that makes machine-to-machine access possible. The security question is not whether they are “like users” in every respect, but whether they create authenticatable, authorisable access paths that need the same governance discipline. In practice, that means owner assignment, inventory, entitlement review, and revocation must apply to them as first-class identities.

That distinction matters because the operational failure modes are identity failures: hidden credentials, stale privileges, orphaned integrations, and shared use across services. NHIs can be created faster and in larger volumes than human accounts, so unmanaged growth turns them into an access-control blind spot rather than a simple configuration issue.

For readers comparing human and machine identity models, Human vs Non-Human Identity is the clearest place to see where the shared governance principles stop and the operating differences begin.

What Changes in the Operating Model for NHIs

The governance baseline is familiar, least privilege, periodic review, clear ownership, and controlled onboarding and offboarding. What changes is how those controls have to be executed. A human user is usually tied to a person, a joiner-mover-leaver process, and an explicit business relationship. An NHI may exist inside an application stack, a cloud integration, or an automation flow with no obvious individual owner unless the organisation deliberately records one.

That means lifecycle control has to be machine-aware. Provisioning often happens through deployment pipelines or platform services rather than tickets, and deprovisioning may need to follow application retirement, secret rotation, or dependency removal instead of employee departure. If the lifecycle is not tied to the system that consumes the identity, the identity survives the workload that created it.

NHI lifecycle management and NHI ownership and accountability both reinforce the same practical point: the identity must have a named owner and a lifecycle that matches the system it serves, not the calendar of a human employee.

Where Human IAM Controls Still Apply, and Where They Fall Short

Core IAM controls still matter for NHIs. They should be inventoried, scoped to minimum necessary access, recertified where feasible, and removed when no longer needed. The difference is that the control evidence looks different. For NHIs, good evidence includes secret rotation status, last-use telemetry, dependency mapping, and the application or service account that owns the identity.

human iam processes often assume interactive login, manual approval, and periodic human review. Those assumptions break down when credentials are embedded in code, distributed across environments, or used by services that authenticate continuously. The governance model therefore needs stronger automation, better discovery, and tighter coupling to change management so that access review keeps pace with engineering change.

Service account security and NHI lifecycle processes are useful references when you need to translate standard IAM expectations into controls that work for integrations, workloads, and automated services.

Risk and Threat Considerations

NHIs create exposure when they are managed as invisible technical dependencies instead of controlled identities. The common failure pattern is privilege accumulation without ownership, which leaves stale secrets, unused accounts, and broad entitlements in place long after the original integration has changed or been forgotten.

Failure mechanism: Bulk creation, embedded credentials, and weak dependency tracking allow an NHI to outlive its business purpose, retain access after system change, or become hard to attribute when abuse occurs.

Impact: Attackers and insiders can exploit forgotten or overprivileged NHIs for persistence, lateral movement, and access to downstream systems, while defenders lose the ability to prove who owns the access or when it should be removed.

Key NHI challenges and risks and Why NHI security matters now both support the same conclusion: the risk is not just excess access, it is unowned access at scale.

Practitioner Guidance

What to prioritise: Start by assigning an owner to every NHI, then confirm whether the identity has a live dependency, a current purpose, and a revocation path. If you cannot answer those three questions quickly, the identity is already under-governed.

What to verify: Check whether your entitlement review process includes machine identities, whether secret rotation is tied to application changes, and whether service account use is visible in logs and inventories. If the only evidence is that “the system still works,” the control is too weak to trust.

Common mistake: Treating NHIs as infrastructure objects that happen to have credentials. That shortcut usually hides the ownership problem, which is the real reason these identities linger and accumulate privilege.

Practitioner takeaway: Use the same governance principles you apply to human users, but enforce them through machine-aware lifecycle, ownership, and telemetry controls, because NHIs fail differently and at much larger scale.

Related resources from NHI Mgmt Group

• Should organisations treat non-human identities differently from human users in governance?
• Should organisations treat AI agents like human users in IAM?
• What is the difference between reviewing human access and reviewing NHIs?
• What is the difference between human IAM controls and NHI governance?