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.