Why do defence suppliers need stronger identity governance for CMMC?

Why This Matters for Security Teams

CMMC is not just a documentation exercise. Defence suppliers must show that identities with access to FCI and CUI are governed throughout their lifecycle, including provisioning, review, and removal. That is difficult when service accounts, API keys, and partner connections accumulate outside the normal employee joiner-mover-leaver process. NIST Cybersecurity Framework 2.0 frames this as an access governance problem, not a checkbox problem.

The practical risk is that access often exists long after the business reason has changed. NHIMG research on the Ultimate Guide to NHIs shows that only 20% of organisations have formal offboarding and revocation processes for API keys, while 97% of NHIs carry excessive privileges. For CMMC assessors, that gap matters because evidence must demonstrate control, not intent. When suppliers cannot prove who can reach regulated data, they also cannot prove that access is limited, monitored, and removed on time. In practice, many security teams discover this only after a supplier review exposes stale credentials that were assumed to be already retired.

How It Works in Practice

Strong identity governance for CMMC starts by treating every identity that can touch regulated data as in scope, including human users, service accounts, workload identities, delegated admin accounts, and third-party integrations. The control objective is simple: know the identity, define the business justification, restrict the entitlement, and remove it when the need ends. That requires more than directory hygiene. It requires evidence that access approvals, periodic reviews, and revocation are tied to the actual systems handling FCI and CUI.

For most suppliers, the most defensible approach is to combine RBAC with tighter lifecycle control and continuous verification. Current guidance suggests organisations should map identities to data access paths, then verify that each identity has a named owner, a documented purpose, and a defined expiry or review date. The operational burden is worth it because NHIMG data shows that secrets exposure is common: Top 10 NHI Issues highlights how often secrets remain outside proper managers and how frequently privileges exceed need.

In practice, teams usually need the following controls:

• Inventory every identity that can access CUI or systems that store or process it.
• Bind each identity to a human owner, system owner, or supplier owner.
• Use least privilege and separate access paths for production, build, and support functions.
• Require periodic recertification and immediate revocation when contracts, tasks, or vendors end.
• Log issuance, use, and removal so audit evidence is available on demand.

This guidance breaks down when environments rely on ad hoc sharing of API keys, unmanaged DevOps tooling, or partner-created service accounts because ownership and revocation become impossible to prove.

Common Variations and Edge Cases

Tighter identity governance often increases operational overhead, requiring organisations to balance certification evidence against delivery speed. That tradeoff is real in defence supply chains, where engineering teams may depend on automation, vendor access, and emergency support channels. Best practice is evolving, but there is no universal standard for exactly how much automation or just-in-time access is enough for every supplier.

Edge cases usually appear in CI/CD pipelines, subcontractor access, and machine-to-machine integrations. A pipeline token that deploys code to a CUI system is not a low-risk convenience credential. It is a regulated access path and should be governed as such. The same applies to cloud roles, shared admin accounts, and temporary vendor support access. NHIMG’s regulatory and audit perspectives section is useful here because it connects NHI lifecycle discipline to evidence retention and reviewability. For broader identity baselines, suppliers should also align with the NIST Cybersecurity Framework 2.0, especially the access governance and continuous improvement functions. Organisations with heavy third-party integration should expect the toughest findings, because partner-owned identities often sit outside the normal approval chain and are the hardest to revoke cleanly.

Related resources from NHI Mgmt Group

• Why is it important to integrate identity and data governance?
• How should security teams evaluate Centrify alternatives for identity governance?
• When does an ITSM platform become part of identity governance?
• How should security teams compare Microsoft 365 admin tools with broader identity governance platforms?