Ownership should sit with the teams that understand both the business purpose and the technical reach of each identity. That includes application owners for service accounts, system owners for integrations, and IAM teams for policy enforcement. Least privilege breaks when no one is accountable for removing access that is no longer needed.
Why This Matters for Security Teams
least privilege ownership is not a paperwork question. It determines who can remove standing access before a human user, service account, API key, or integration becomes an escalation path. When ownership is unclear, access reviews drift, exceptions multiply, and no one is accountable for shrinking reach after a business change. That creates avoidable exposure across both human and machine identities.
For non-human identities, the risk is sharper because credentials are often embedded in applications, pipelines, and third-party integrations. NHIMG’s Top 10 NHI Issues and the OWASP Non-Human Identity Top 10 both highlight over-privilege and weak lifecycle control as recurring failure modes. The operating model matters as much as the tooling, because least privilege decays whenever business owners, IAM teams, and platform teams all assume someone else will act.
NHIMG research on the State of Non-Human Identity Security found that only 1.5 out of 10 organisations are highly confident in securing NHIs, which is a strong signal that ownership gaps are still common. In practice, many security teams encounter excessive access only after an integration is compromised or an application owner has already moved on.
How It Works in Practice
The most workable model is shared ownership with clear decision rights. Business or application owners should define why the identity exists and what it must do. IAM, PAM, or security engineering should define how access is granted, reviewed, and revoked. Platform and system owners should validate the technical reach, especially for service accounts, CI/CD runners, workload identities, and third-party OAuth apps.
For human identities, ownership usually sits with the manager and the application owner together, while IAM enforces the policy. For machine identities, the owner should normally be the team that operates the workload or integration, because that team can verify whether access is still needed. The security function should not become the default owner of every permission, but it must own the control framework, review cadence, and exception handling. That distinction is consistent with NIST Cybersecurity Framework 2.0 and NIST SP 800-207 Zero Trust Architecture, where access decisions are tied to context and continual verification rather than one-time approval.
A practical workflow usually includes:
- An authoritative owner for each identity, recorded in the IAM or CMDB system of record.
- A named approver for access changes and a separate reviewer for periodic recertification.
- Role definitions that describe the business function, not just the technical group.
- Automatic removal or re-scoping when a service, project, or vendor relationship changes.
That is especially important for non-human identities documented in NHIMG’s Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs, where lifecycle ownership is what prevents stale access from persisting long after deployment. These controls tend to break down when ownership is split across outsourced delivery teams and no internal account holder remains accountable for the identity.
Common Variations and Edge Cases
Tighter ownership often increases operational overhead, requiring organisations to balance faster delivery against stronger accountability. That tradeoff is real, especially where engineering teams move quickly or where a single service account supports multiple applications. Best practice is evolving, but there is no universal standard for this yet: some organisations centralise approval, while others decentralise ownership and centralise policy enforcement.
Edge cases appear when the same identity is shared by several teams, when a vendor manages part of the stack, or when an identity is tied to an ephemeral workload rather than a long-lived system. In those cases, the practical owner should be the team that can actually answer three questions: what uses the identity, what it can reach, and when it should be removed. NHIMG’s Ultimate Guide to NHIs — Key Challenges and Risks is useful here because it frames ownership as a lifecycle control, not a one-time approval.
For highly regulated environments, the Ultimate Guide to NHIs — Regulatory and Audit Perspectives is the better reference point, since auditors will usually expect a named owner, a review trail, and evidence that excess access was removed. In practice, shared ownership fails when no single team can be held responsible for revocation after the original business need has expired.
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 ownership starts with assigning responsibility for each NHI. |
| NIST CSF 2.0 | PR.AC-4 | Least privilege depends on access permissions being managed and reviewed. |
| NIST Zero Trust (SP 800-207) | Zero Trust requires continual authorization and clear ownership of access decisions. |
Use context-aware access checks and assign revocation responsibility to the team that knows the workload.
Related resources from NHI Mgmt Group
- Who should own least privilege governance across humans and non-human identities?
- Who should own least privilege when human and machine identities both use sensitive access?
- Who should own Zero Trust governance across human and machine identities?
- How should teams measure identity governance maturity across human and non-human identities?
