Ownership should sit with both security and operational leadership, because access decisions affect uptime as much as cyber risk. Manufacturing identity governance works best when plant constraints, OT realities, and IAM policy are handled as one operating model rather than separate programmes.
Why This Matters for Security Teams
When plant systems are connected to ERP, MES, analytics, and cloud services, identity governance becomes an uptime issue as much as a security issue. A service account that is overprivileged, never rotated, or reused across sites can move from a convenience layer into a production outage path. NHIs already create material exposure in enterprise environments, and NHI Management Group notes that only 5.7% of organisations have full visibility into their service accounts in the Ultimate Guide to NHIs.
In Industry 4.0, security teams often inherit identities that were created for machine-to-machine integration, not for governed lifecycle management. Operations leaders usually care about deterministic change windows, vendor maintenance access, and plant continuity, while security cares about least privilege, traceability, and revocation. The governance owner has to reconcile both. Frameworks like the NIST Cybersecurity Framework 2.0 help structure that accountability, but the operating model still has to be local to the plant and enterprise stack. In practice, many security teams discover identity sprawl only after a maintenance account, API key, or remote support credential has already been abused.
How It Works in Practice
The best ownership model is shared governance with clear decision rights. Security should own identity policy, assurance, logging, and incident response. Operational leadership should own production constraints, asset criticality, change approvals, and vendor access timing. In mature environments, a joint steering process handles exceptions, while a single control plane enforces identity lifecycle rules across OT and IT. NHI Management Group’s 52 NHI Breaches Analysis and Top 10 NHI Issues both reinforce a common pattern: identities fail when ownership is ambiguous and review cycles are too slow.
Practitioners should treat plant-connected identities as governed assets with named custodians. That means:
- Assigning a business owner for each service account, API key, certificate, or integration token.
- Using least privilege and separating read, write, and admin functions wherever possible.
- Requiring time-bound approvals for vendor and support access, with automatic expiry.
- Logging issuance, rotation, and revocation events in a system both IT and OT can review.
- Reviewing plant-to-enterprise dependencies during change management, not after deployment.
For implementation, identity governance should align with OT change control, asset inventory, and secure remote access workflows. Current guidance suggests using the security function to set control standards and the operational function to validate safe operating windows. This avoids the common failure mode where a plant team keeps a credential alive because production cannot tolerate an outage, but no one has authority to rotate or retire it. These controls tend to break down in heavily customised brownfield environments because undocumented dependencies make revocation risky without a tested fallback path.
Common Variations and Edge Cases
Tighter identity governance often increases coordination overhead, requiring organisations to balance stronger control against maintenance speed and uptime risk. That tradeoff becomes sharper in 24/7 plants, multi-vendor environments, and legacy OT stacks that cannot support modern federated identity. There is no universal standard for this yet, so current guidance suggests prioritising risk-based ownership rather than forcing every identity into the same approval model.
Edge cases usually involve shared service accounts, emergency access, and vendor-managed connections. In those situations, security should not fully own the business decision, but it should still own control requirements such as MFA where feasible, session recording, certificate rotation, and break-glass review. Operational leadership should define when emergency access is justified and how quickly it must be removed. The Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs is especially relevant here because lifecycle discipline is what prevents temporary access from becoming standing privilege. In practice, the hardest failures appear when a vendor integration is considered “temporary” for years, because no one owns its offboarding.
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 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Ownership and lifecycle gaps are core NHI governance failures. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access is central when OT and IT identities converge. |
| CSA MAESTRO | GOV-2 | Shared governance is needed for AI-like autonomous or automated control paths. |
Assign named owners and enforce lifecycle controls for every plant-connected NHI.
