Who is accountable when access governance fails across human and machine identities?

Why This Matters for Security Teams

When access governance fails across human and machine identities, the impact is rarely confined to a single missed review. It can expose privileged accounts, stale secrets, unmanaged API keys, and orphaned service identities that still have production reach. NHI governance is especially fragile because ownership often spans IAM, application, platform, and control functions. That means a policy can exist on paper while no one is clearly responsible for revocation, rotation, or evidence. Current guidance from OWASP Non-Human Identity Top 10 and NIST Cybersecurity Framework 2.0 both point toward accountable access control, but the operational gap is usually in handoffs, not intent.

For machine identities, that gap is bigger because access is often embedded in code, pipelines, and workloads rather than attached to a named person. A single missed lifecycle step can leave secrets active long after the business reason for access has expired. NHIMG’s Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs frames this as a lifecycle problem as much as an authorization problem, and the Top 10 NHI Issues research consistently shows that weak governance patterns persist when identities are created faster than they are retired. In practice, many security teams encounter the failure only after a production incident or audit exception has already exposed the ownership gap.

How It Works in Practice

Accountability should be split across three functions: the business owner decides why access is needed, the technical owner operates the identity and its lifecycle, and the control owner proves that the process worked. That structure matters because governance failure usually happens at the seams. A manager may approve a human user, a platform team may create a token for a workload, and a security team may assume the other side handled revocation. For NHIs, that is a common path to stale access.

Practically, mature programmes map each identity to a clear owner, a defined purpose, an expiry, and an evidence trail. For human identities, this often means periodic recertification, role validation, and prompt deprovisioning. For machine identities, it means secret inventory, rotation, scoped permissions, and lifecycle hooks tied to deployment and decommission events. NHIMG’s Ultimate Guide to NHIs — Regulatory and Audit Perspectives is useful here because auditors increasingly expect proof of ownership, not just policy language. The same expectation is reflected in OWASP Non-Human Identity Top 10, which treats unmanaged secrets and excessive privilege as recurring exposure points.

• Assign one accountable business owner per resource, not per team.
• Assign one technical owner per identity, secret, or workload credential.
• Require one evidence owner to capture approvals, rotation, and revocation proof.
• Link access reviews to actual lifecycle events, not arbitrary calendar dates.
• Use short-lived credentials where possible so revocation is built into the design.

This guidance tends to break down in highly automated environments where identities are created by CI/CD, agents, or ephemeral workloads faster than governance tickets can be processed.

Common Variations and Edge Cases

Tighter governance often increases operational overhead, so organisations have to balance accountability against deployment speed and service reliability. That tradeoff becomes visible in environments with many short-lived workloads, third-party integrations, or delegated admin models. There is no universal standard for exactly how to split accountability across product, platform, and security teams, but current guidance suggests the business owner must remain answerable for access necessity while the technical owner remains answerable for lifecycle enforcement.

Edge cases appear when one identity serves multiple services, when a vendor manages access on behalf of the business, or when a machine identity is embedded in code that multiple teams touch. In those situations, it helps to separate decision rights from operational responsibility. The approver should be able to explain the business need, the operator should be able to revoke or rotate immediately, and the control owner should be able to show evidence without asking for manual reconstruction. NHIMG’s Ultimate Guide to NHIs and 52 NHI Breaches Analysis both show why this matters: failures rarely come from one missing policy, but from unclear ownership across the full chain of approval, provisioning, monitoring, and retirement.

In regulated environments, that chain should be aligned to NIST Cybersecurity Framework 2.0 and audited against documented control ownership, because accountability that cannot be evidenced is not operationally real.

Related resources from NHI Mgmt Group

• Why do machine identities need different governance than human accounts?
• How should security teams run access reviews for non-human identities?
• How should security teams govern non-human identities that have persistent access?
• How should organisations govern identity risk across human, NHI, and automated access?