They often treat identity as an administrative layer instead of an operational control. In manufacturing, access governance affects safety, uptime, and supply chain continuity, so over-permissioned accounts and weak session controls create direct business risk, not just compliance exposure.
Why This Matters for Security Teams
Industry 4.0 identity failures rarely stay inside IAM. When machine-to-machine access, service accounts, contractors, and embedded software identities are treated as administrative detail, the result is often uncontrolled privilege spread across production systems, OT gateways, and cloud-connected tooling. NHI Management Group’s Ultimate Guide to NHIs notes that NHIs outnumber human identities by 25x to 50x in modern enterprises, which is why small governance gaps become operational exposure quickly.
Security teams also underestimate how frequently identity drift appears in plant environments, where accounts persist long after a line change, a vendor handoff, or a CI/CD pipeline update. The NIST Cybersecurity Framework 2.0 treats identity as part of enterprise risk management, not just access administration, and that framing is critical for connected manufacturing. In practice, many security teams discover over-permissioned machine access only after a failed audit, a ransomware event, or a production outage has already exposed the weakness.
How It Works in Practice
The most common mistake is applying human IAM patterns to non-human workloads. In Industry 4.0, identities are not just users; they are PLC integrations, MES connectors, robot orchestration services, API clients, and automation scripts. These identities behave differently because they execute continuously, call other systems at machine speed, and often need access only for a narrow task window. Static RBAC alone cannot express that reality well enough.
Practitioners generally need three controls working together:
- Workload identity for machines and services, so each component has cryptographic proof of what it is, not just a password or shared key.
- Just-in-time access and short-lived secrets, so credentials are issued for a specific action and revoked automatically after use.
- Policy evaluation at request time, so authorisation can account for line state, maintenance windows, supplier context, and operational risk.
This is where current guidance from the Ultimate Guide to NHIs and the NIST Cybersecurity Framework 2.0 converges: identity should support least privilege, rotation, offboarding, and visibility across the full machine lifecycle. In practice, that means rotating secrets aggressively, eliminating shared service credentials, and tying every automation account to an owner, purpose, and expiry condition. Without that structure, identity sprawl becomes invisible until an OT vendor connection, a stale API key, or an overly broad robot integration is abused. These controls tend to break down when legacy production systems require persistent shared credentials because the architecture cannot enforce per-workload identity or short-lived token issuance.
Common Variations and Edge Cases
Tighter identity control often increases operational overhead, requiring organisations to balance safety and uptime against integration complexity. That tradeoff is real in brownfield plants, where older PLCs, historians, and vendor-maintained systems may not support modern token-based authentication or fine-grained policy checks.
Guidance is evolving here. Current best practice suggests compensating controls when native workload identity is not possible, including network segmentation, jump-host mediation, session recording, and aggressive credential vaulting. But these are fallback measures, not substitutes for proper machine identity governance. The 52 NHI Breaches Analysis shows how repeated identity weaknesses often recur through the same patterns: excessive privilege, poor rotation, and weak visibility.
Security teams also get tripped up by vendor access. In manufacturing ecosystems, third-party maintenance accounts and remote service channels are often treated as exceptional, which makes them persist far longer than intended. The practical answer is not to deny all external access, but to make it time-bound, auditable, and tied to a specific purpose. Where systems cannot support that model, organisations should document the exception and treat it as a managed risk, not a normal control state.
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 | Covers over-privilege and weak lifecycle control for non-human identities. |
| NIST CSF 2.0 | PR.AC-4 | Identity and access management is central to limiting industrial system exposure. |
| CSA MAESTRO | Agentic and workload governance principles apply to autonomous industrial automations. |
Inventory every machine identity, remove shared credentials, and enforce least privilege with ownership and expiry.
Related resources from NHI Mgmt Group
- What do security teams get wrong about risk assessment in identity programmes?
- What do teams get wrong about machine identity security in AI programmes?
- What do security teams get wrong about certification programmes for identity practitioners?
- What do security teams get wrong about workload identity in cloud and CI/CD environments?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
