Restrict Guest Access to Allowlisted Domains for FedRAMP Compliance
Learn how EXT-03 helps you meet FedRAMP requirements for Microsoft 365 and Entra ID security.
Organizations pursuing FedRAMP compliance need to address restrict guest access to allowlisted domains as part of their security program. The EXT-03 control maps directly to FedRAMP requirements, helping demonstrate compliance while strengthening your security posture.
How EXT-03 Addresses FedRAMP Requirements
FedRAMP requires organizations to implement controls around restrict guest access to allowlisted domains. The EXT-03 control provides:
- Guest invitations are restricted to an allowlist of trusted domains
- Cross-tenant access policies block all other external tenants
- External sharing in SharePoint/OneDrive is restricted to allowed domains
These measures directly support FedRAMP compliance by ensuring proper external security in your Microsoft 365 environment.
Implementation for Compliance
To satisfy FedRAMP requirements with this control:
- **Enable the control** - Use TrueConfig's one-click remediation
- **Document your implementation** - Record how the control was configured
- **Maintain evidence** - TrueConfig automatically logs compliance status
- **Monitor continuously** - Track any deviations from the expected state
Evidence Collection
For FedRAMP audits, you'll need to demonstrate:
- Current configuration state
- Historical compliance data
- Remediation actions taken
- Continuous monitoring in place
TrueConfig provides all of this evidence through its audit trail and reporting features.
Why This Control Matters for FedRAMP
At Level 3, external collaboration is tightly controlled. Only pre-approved partner organizations can access your tenant. This prevents social engineering and limits data exposure to vetted third parties.
Implementing EXT-03 is an important step toward FedRAMP compliance. Combined with TrueConfig's continuous monitoring, you can demonstrate ongoing adherence to FedRAMP requirements.
Ready to achieve FedRAMP compliance?
TrueConfig continuously monitors your Microsoft 365 tenant for compliance with FedRAMP requirements, including this control.