Why do supplier identities create such a large risk in automotive ecosystems?

Why This Matters for Security Teams

Supplier identities are risky in automotive ecosystems because they sit inside the operational fabric of engineering, manufacturing, logistics, and service support rather than at the edge of one system. A single vendor account, support credential, or API token can cross trust boundaries and touch telematics, plant systems, dealer platforms, and connected vehicle services. That makes supplier identity a supply chain issue, not just an access review problem.

Current guidance from NIST Cybersecurity Framework 2.0 and NHI research from Ultimate Guide to NHIs — Why NHI Security Matters Now both point to the same operational reality: identities that are widely distributed, poorly inventoried, or over-permissioned are hard to contain once compromised. In the automotive sector, that problem is amplified by long supplier chains, production uptime pressure, and the need for temporary exceptions during launches, recalls, and support events. NHIMG research shows that 92% of organisations expose NHIs to third parties, which is especially relevant when supplier access is embedded in day-to-day workflows.

In practice, many security teams discover supplier identity exposure only after a maintenance account, integration token, or remote support path has already been abused to move laterally across business-critical systems.

How It Works in Practice

Supplier identities become dangerous when access is persistent, broad, and difficult to attribute back to a specific business purpose. In automotive environments, that often includes service accounts for plant integration, vendor-managed APIs for parts or warranty systems, remote diagnostics for dealerships, and temporary access for software or firmware support. Each of these can be legitimate on its own, but together they create a dense web of trust that attackers can exploit.

Good practice is to treat supplier identities as non-human identities with explicit lifecycle controls. That means inventorying every external identity, tying it to a named supplier and contract, classifying the business function it supports, and removing shared or orphaned credentials. Where possible, use just-in-time access, short-lived tokens, and workload identity rather than long-lived static secrets. Security teams should also enforce least privilege, separate production and non-production access, and require stronger controls for privileged support paths. The The 2024 ESG Report: Managing Non-Human Identities and the Ultimate Guide to NHIs — Key Challenges and Risks both underline that third-party exposure and weak visibility are common failure points, not edge cases.

For verification and monitoring, align supplier identity controls with NIST SP 800-53 Rev 5 Security and Privacy Controls and log every privileged action with enough context to answer who accessed what, for which supplier, and under what approval. This is especially important where vendors support multiple brands or plants from the same remote access path, because a single compromise can span environments that were assumed to be separate. These controls tend to break down when supplier access is granted through emergency exceptions that are never formally revoked, because standing privilege quietly becomes normal operations.

Common Variations and Edge Cases

Tighter supplier controls often increase operational overhead, so organisations have to balance resilience against the need to keep production, service, and recall workflows moving. That tradeoff is especially sharp in automotive ecosystems, where uptime and supplier responsiveness can outweigh the convenience of strict segregation unless governance is built in from the start.

There is no universal standard for supplier identity governance yet, but current guidance suggests a few consistent patterns. First, OEM-owned identities and supplier-owned identities should not be managed the same way when the risk and accountability differ. Second, shared vendor accounts remain a major liability because they destroy traceability, even if they are easy to operate. Third, not all supplier access is equal: a software update partner, a logistics integrator, and a remote diagnostics provider may need different controls, approval paths, and revocation thresholds. NHI incidents such as the Schneider Electric credentials breach and the JetBrains GitHub plugin token exposure show how quickly trusted integration paths can become enterprise-wide exposure.

For this reason, best practice is evolving toward supplier-specific trust boundaries, continuous review of dormant access, and explicit offboarding when a contract ends or a tool is retired. Automotive ecosystems that still rely on long-lived credentials, broad VPN reach, or informal support exceptions are usually the ones that feel the impact most sharply after a compromise, not before it.

Related resources from NHI Mgmt Group

• Why do collaboration tools create such a large secrets risk?
• Why do non-human identities create more audit risk than human accounts?
• Why do non-human identities create audit risk in modern environments?
• Why do non-human identities create compliance risk even when policies exist?