IAM, PAM, and application owners should share responsibility, because least privilege fails when ownership is split between provisioning, approval, and revocation. Human users, service accounts, and tokens all need accountable owners and an enforced offboarding path. Without clear ownership, excess access becomes nobody’s problem until an incident exposes it.
Why Least Privilege Ownership Needs a Shared Control Model
least privilege across humans and non-human identities fails when one team approves access, another provisions it, and nobody owns the revocation path. That split is especially risky for service accounts, tokens, and API keys because they often outlive the workflow that created them. NHI Management Group’s lifecycle guidance for NHIs treats ownership as a lifecycle control, not a one-time admin task. The same principle appears in the NIST Cybersecurity Framework 2.0, where accountable governance must connect policy, enforcement, and review.
This matters because excess access is rarely created deliberately. It accumulates through onboarding shortcuts, missed offboarding, inherited permissions, and automation that keeps running after the business need changes. In NHI environments, that drift is harder to spot because many identities are embedded in applications, CI/CD pipelines, and third-party integrations. NHIMG’s Top 10 NHI Issues places lifecycle and visibility failures near the center of the problem, which is why ownership must be explicit and auditable. In practice, many security teams discover privilege creep only after an application token is reused, not through a planned review cycle.
How Shared Ownership Works in Practice
Effective least privilege governance is usually divided by function, but not by accountability. IAM teams should define the control model, PAM teams should handle privileged access enforcement, and application or service owners should attest to business need and accept exceptions. For NHIs, that means every service account, API token, certificate, and workload identity needs an accountable owner, a recorded purpose, and a defined revocation trigger. Guidance from the OWASP Non-Human Identity Top 10 and NIST SP 800-207 Zero Trust Architecture reinforces that standing access should be minimized and verified continuously, not trusted because it was once approved.
- Assign a business owner for each identity, not just a technical custodian.
- Require periodic attestation for humans and NHIs on separate review cadences.
- Link offboarding to HR, app decommissioning, and secret rotation workflows.
- Track orphaned identities, unused credentials, and over-scoped roles as distinct findings.
- Use PAM or policy controls to enforce approval, just-in-time elevation, and revocation.
NHIs need the same discipline as human access, but the operational pattern differs: human access changes with role, while NHI access changes with code, deployment, and integration state. That is why many mature programs tie ownership to service catalogs, CMDB entries, or application registries rather than to a directory record alone. The outcome is measurable accountability, not symbolic approval. These controls tend to break down in environments with unmanaged SaaS integrations or ephemeral CI/CD tokens because the owner cannot be inferred from the system of record.
Common Variations and Edge Cases
Tighter ownership controls often increase administrative overhead, so organisations have to balance review quality against release speed and operational friction. There is no universal standard for how often every identity class should be reviewed, and current guidance suggests using risk-based cadence rather than forcing a single schedule across all assets. High-impact production tokens may need frequent attestation, while low-risk internal accounts can follow a longer cycle if compensating controls are strong.
Edge cases appear when ownership is shared across teams, vendors, or automation platforms. In those cases, the best practice is evolving toward explicit primary ownership with secondary approvers, because diffuse responsibility makes revocation slow and ambiguous. This is also where the NHI security gap becomes visible: NHIMG’s State of Non-Human Identity Security reports that only 1.5 out of 10 organisations are highly confident in securing NHIs, which is a strong signal that ownership, not just tooling, is the weak point. The most reliable programs document one accountable owner per identity, even when many teams influence its access model.
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 Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Least privilege breaks when NHI ownership and lifecycle controls are unclear. |
| NIST CSF 2.0 | PR.AC-4 | Access management requires timely approval and removal of entitlements. |
| NIST Zero Trust (SP 800-207) | Zero Trust expects continuous verification instead of permanent trust. |
Assign one accountable owner per NHI and enforce review, rotation, and revocation across its lifecycle.
Related resources from NHI Mgmt Group
- Who should own least privilege when human and machine identities both use sensitive access?
- Who should own access request governance across human and non-human identities?
- How should security teams govern non-human identities at scale?
- How should security teams govern non-human identities for compliance?
