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10/07/2026 9:10 pm
TL;DR: C3PAOs say the most expensive CMMC failures come from treating certification as a one-time project, especially when organizations exclude security protection assets, write SSPs that do not match reality, and misunderstand shared responsibility, according to Secureframe. The real issue is operational truth, not documentation volume: controls that are not continuously lived will not survive assessment.
NHIMG editorial — based on content published by Secureframe: The 7 Biggest CMMC implementation mistakes C3PAOs are seeing in real assessments
By the numbers:
- Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them.
- 90% of IT leaders say properly managing NHIs is essential for a successful zero-trust implementation.
- 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools.
Questions worth separating out
Q: What breaks when CMMC scope excludes security protection assets?
A: When security protection assets are excluded, the assessment boundary no longer matches the systems that actually protect CUI.
Q: Why do identity and access controls matter so much in CMMC assessments?
A: Identity and access controls often sit in the path that protects CUI, even when they do not directly store the data.
Q: How do organisations know if their SSP reflects reality?
A: An SSP reflects reality when control owners can describe the environment the same way the document does, and when supporting procedures and live evidence match that description.
Practitioner guidance
- Map security protection assets as part of CMMC scope Inventory identity platforms, remote access paths, ticketing systems, endpoint tools, and other systems that protect CUI even if they do not store it.
- Test enclave design against real workflows Walk through how CUI arrives, moves, gets printed, gets shared, and is administered in day-to-day operations.
- Reconcile the SSP with live control ownership Make sure the system security plan, operating procedures, and actual administration all tell the same story.
What's in the full article
Secureframe's full blog covers the operational detail this post intentionally leaves for the source:
- The C3PAO assessment cues that expose a mismatched SSP before Phase 2 begins.
- The enclave workflow checks that reveal when CUI will still leak outside the assessed boundary.
- The shared-responsibility distinctions that matter when MSPs operate controls inside your environment.
- The documentation patterns assessors see when templates or AI-generated SSPs do not match reality.
👉 Read Secureframe's analysis of the 7 biggest CMMC implementation mistakes →
CMMC implementation mistakes: what C3PAOs keep flagging in assessments?
Explore further
10/07/2026 9:34 pm
Scope failure is the real control failure in CMMC programmes. The article shows that organisations do not usually fail because they lack a policy. They fail because they misidentify which systems actually enforce the policy. In CMMC terms, security protection assets are not peripheral. They are part of the control environment, and identity infrastructure is often the most important SPA class because it governs who can reach CUI. Practitioners should treat access and control-plane assets as first-class scope items.
A question worth separating out:
Q: Who is accountable when an MSP helps operate CMMC controls?
A: The assessed organisation remains accountable. An MSP can help run controls, but it does not take over the obligation to prove those controls are operating correctly in the organisation’s environment. The authorising official and internal control owners still need to understand, evidence, and sign for what is happening in practice.
👉 Read our full editorial: CMMC implementation mistakes show the gap between certification and reality
