CMMC 3.5.3 MFA Evidence in Microsoft GCC High (Entra ID)
Control: NIST SP 800-171 Rev. 2 §3.5.3 · CMMC Practice: IA.L2-3.5.3 · Environment: Microsoft GCC High / Entra ID · Updated June 2026
Plain-English answer
The requirement is identical to the standard control — MFA for local and network access to privileged accounts, and network access to non-privileged accounts. In GCC High you enforce and evidence it through Entra ID: Conditional Access policies, the Authentication Methods report, and privileged-role enforcement (typically via PIM). See the general 3.5.3 page for the full control breakdown.
The four objectives, mapped to Entra
- [a] privileged accounts identified → your list of admin/privileged roles (Global Admin, Security Admin, etc.) and any standing vs. eligible (PIM) assignments.
- [b] MFA for local & network privileged access → Conditional Access requiring MFA for admin roles, plus MFA on the management planes (Azure portal / Entra admin center / privileged workstation sign-in).
- [c] non-privileged accounts identified → your standard user population in Entra.
- [d] MFA for network non-privileged access → Conditional Access requiring MFA for all users on network access to in-scope apps.
What the assessor will EXAMINE
- The Conditional Access policy/policies requiring MFA, with the assigned users/groups and the targeted cloud apps.
- The Authentication Methods registration report (who is registered for which methods).
- PIM configuration for privileged roles (eligible assignments + activation requiring MFA).
- Authentication Methods policy showing allowed methods (Authenticator, FIDO2 keys, certificate-based auth; SMS posture).
- SSP narrative for 3.5.3 referencing these GCC High artifacts.
What the assessor will INTERVIEW & TEST
- Interview: "Show how an admin's MFA is enforced when they sign in to the Entra admin center vs. a network app." Walk the Conditional Access logic and the method used.
- Test: Witness a privileged sign-in (admin center) and a non-privileged network sign-in — confirm MFA fires both times.
- Test: Sample users in the Authentication Methods report against the privileged-role list for gaps.
Evidence examples (GCC High)
- Conditional Access policy export (JSON or screenshot) — scope, conditions, grant = require MFA.
- Authentication Methods activity/registration report, dated.
- PIM role settings showing MFA-on-activation for privileged roles.
- Authentication Methods policy showing approved factor types.
- Exception register for any break-glass/service identities with compensating controls.
Common GCC High failure patterns
- Break-glass accounts excluded from Conditional Access with no documented compensating control or monitoring.
- Legacy authentication not blocked — a bypass around the MFA policy.
- MFA required for apps but not for the admin/management planes — privileged local/network access gap.
- Relying on per-user MFA toggles instead of Conditional Access, making evidence inconsistent.
SPRS impact & POA&M
SPRS: not meeting 3.5.3 is a 5-point deduction. POA&M: confirm 3.5.3's POA&M eligibility against current CMMC rules before relying on it.
Mapping 3.5.3 in GCC High? Get a GCC High CMMC evidence map →
Related: 3.5.3 MFA (general) · All control pages
Athena prepares organizations for CMMC Level 2; certification rests with C3PAOs/DIBCAC. Verify all control facts against NIST SP 800-171 Rev. 2, NIST SP 800-171A, and current CMMC rules.