Accountability stays with the organisation, but operational responsibility becomes blurred when no single architecture ties detection, verification, and response together. That is why regulated environments increasingly need an identity-led control plane that can support both access governance and evidence retention.
Why This Matters for Security Teams
When physical and cyber controls are managed in separate chains of command, accountability becomes an audit problem before it becomes a technical one. The organisation still owns the risk, but no single team can reliably answer who approved access, who verified the identity event, and who must preserve evidence after a failure. That gap is especially dangerous in regulated environments where badge logs, logical access logs, and incident records must tell one consistent story.
NHI Management Group’s Ultimate Guide to NHIs — Regulatory and Audit Perspectives frames this as an evidence and governance issue, not just an access-control issue. The practical lesson is that fragmented ownership creates delay, and delay creates ambiguity in both root cause analysis and regulator response. Current guidance from the NIST Cybersecurity Framework 2.0 still expects clear governance, but it does not remove the operational burden of stitching together separate physical and cyber control planes.
Where NHI or machine accounts are involved, this problem compounds because the identity is often acting faster than the control owners can coordinate. In practice, many security teams encounter missing accountability only after a badge event, token misuse, or privileged session has already crossed both domains.
How It Works in Practice
The cleanest operational model is to assign accountability to one control owner or service owner, while allowing physical security and cyber security to retain their specialist duties. That owner should be responsible for the full chain: onboarding, access approval, monitoring, event correlation, and evidence retention. This is the same logic behind identity-led governance for NHIs, where access is not treated as a one-time grant but as a lifecycle process. The NHI Lifecycle Management Guide and the Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs both support this operational framing.
Practitioners usually reduce ambiguity by defining three things:
- One accountable owner for each protected process, system, or facility zone.
- Shared control evidence, so badge events, authentication events, and alerting records can be correlated.
- Escalation rules that define who acts first when a physical and cyber event occur together.
For teams managing machine identities, this becomes even more important because service accounts, API keys, and automated workflows can move across systems without a human in the loop. NHI governance should therefore be tied to the same response chain used for physical control exceptions, with immutable logs and short review windows. Research from the 52 NHI Breaches Analysis shows why this matters: once identity evidence is scattered, containment slows and attribution weakens. These controls tend to break down in large outsourced estates where facilities, IAM, and SOC operations sit in separate contracts because no single party owns the combined record.
Common Variations and Edge Cases
Tighter cross-domain accountability often increases coordination overhead, requiring organisations to balance faster incident response against stricter governance. In some environments, such as shared campuses, hospitals, or industrial sites, physical security may sit with a landlord or managed service provider while cyber controls remain internal. Best practice is evolving here, and there is no universal standard for shared accountability models yet.
The safest approach is to write the handoff rules into contracts, operating procedures, and incident runbooks so that evidence retention does not depend on informal coordination. Where privileged automation or NHIs are involved, current guidance suggests aligning the accountable owner with the system that issues or consumes the identity, not merely the team that administers the badge system or SIEM. The Ultimate Guide to NHIs — Why NHI Security Matters Now is useful here because it reinforces how quickly identity sprawl creates governance gaps.
For organisations under audit, the key edge case is not whether controls exist, but whether one named owner can prove end-to-end oversight across physical and cyber events. Where that cannot be shown, accountability is usually assumed to exist on paper but disappears during the investigation.
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 AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | GV.OC-03 | Governance accountability for cyber risk maps to this question. |
| OWASP Non-Human Identity Top 10 | NHI-05 | Identity lifecycle and oversight are central when controls are split. |
| NIST AI RMF | GOVERN | Accountability and documentation are core AI RMF governance needs. |
Assign one accountable owner for combined physical and cyber control outcomes.
