How can manufacturers reduce the blast radius of compromised machine identities?

Why This Matters for Security Teams

Manufacturing environments amplify the impact of a compromised machine identity because a single credential often sits inside a live production path, not a sandbox. If that identity can call a PLC gateway, MES API, CI/CD runner, or supplier integration, the attacker may not need to break security again to move laterally. NHIMG research shows that 97% of NHIs carry excessive privileges, which widens that path unless entitlements are deliberately narrowed, and the The 52 NHI breaches Report shows how often identity misuse becomes the entry point for broader compromise.

The practical mistake is treating machine identities like fixed equipment labels instead of active access mechanisms. A service account, API key, or connector secret should be thought of as a live attack surface with its own blast radius. That is why Zero Trust guidance matters here: Ultimate Guide to NHIs — Why NHI Security Matters Now ties identity sprawl to exposure, while NIST’s Zero Trust model expects continuous verification rather than assumed trust. In practice, many security teams encounter identity blast radius only after a connector is abused and production telemetry shows the damage, rather than through intentional testing.

How It Works in Practice

Reducing blast radius starts with isolating each machine identity to one job, one environment, and one trust boundary. In manufacturing, that usually means splitting identities by line, cell, vendor integration, and automation workflow instead of letting one shared credential drive multiple systems. The next step is to remove standing access wherever possible and replace it with tightly scoped, short-lived access tokens. For NHI-heavy environments, this aligns with a Zero Trust approach and with the operational lessons documented in the JetBrains GitHub plugin token exposure, where a compromised token became a durable foothold. A workable pattern is:

• Assign one workload identity per service, connector, or robot cell.
• Issue just-in-time credentials only for the task being executed.
• Bind access to context such as target system, time window, and source workload.
• Store secrets in a vault and rotate them on a schedule that matches process criticality.
• Log every non-human request so abuse can be traced back to a specific identity.

This also means validating what happens when a token is abused: can it reach only one API, or can it pivot into OT, ERP, or supplier networks? Where manufacturers are adding autonomous agents for scheduling, quality inspection, or maintenance orchestration, the same logic applies to runtime authorisation. Current guidance suggests evaluating intent at request time rather than assuming a static role can safely describe behaviour, a lesson echoed in the Anthropic — first AI-orchestrated cyber espionage campaign report on how tool-using systems can chain actions quickly. These controls tend to break down when shared service accounts are embedded in legacy SCADA paths because the dependency graph is opaque and access removal risks production downtime.

Common Variations and Edge Cases

Tighter identity containment often increases operational overhead, requiring organisations to balance reduced blast radius against integration complexity and production uptime. That tradeoff is especially visible in plants that rely on older MES, historian, or OPC-style connectors that were never designed for short-lived credentials or workload-bound identity proofing. There is no universal standard for this yet, but best practice is evolving in three areas. First, for autonomous systems and agentic workflows, static RBAC is often too coarse because behaviour is dynamic; intent-based or context-aware authorisation is a better fit when agents select tools on the fly. Second, JIT provisioning works best when paired with workload identity, because short-lived secrets are only useful if the system can prove what the workload is at runtime. Third, segmentation should reflect business process boundaries, not just network topology, so a compromised quality-inspection service cannot reuse the same trust path as a production-control service. Manufacturers also need to watch for third-party and supply-chain exposure. NHIMG notes that 92% of organisations expose NHIs to third parties, which makes supplier tokens and integrator credentials a frequent blast-radius multiplier. For broader identity governance context, the 52 NHI Breaches Analysis helps show why secrets that remain valid after compromise notification keep the risk window open. In mixed OT and IT estates, these controls work best when rolled out to high-value workflows first, because a full redesign is rarely realistic in one change cycle.

Related resources from NHI Mgmt Group

• How can organisations reduce the blast radius of compromised agent identities?
• When does least privilege break down for machine identities?
• How can organisations reduce the blast radius of compromised AI or SaaS integrations?
• How can organisations reduce blast radius when an AI tool is compromised?