Restrict Guest Access to Allowlisted Domains for ISO 27001 Compliance
Learn how EXT-03 helps you meet ISO 27001 requirements for Microsoft 365 and Entra ID security.
ISO 27001 compliance requires implementing specific controls around restrict guest access to allowlisted domains. This page explains how TrueConfig's EXT-03 control helps you meet ISO 27001 requirements in your Microsoft 365 environment.
How EXT-03 Addresses ISO 27001 Requirements
ISO 27001 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 ISO 27001 compliance by ensuring proper external security in your Microsoft 365 environment.
Implementation for Compliance
To satisfy ISO 27001 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 ISO 27001 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 ISO 27001
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 ISO 27001 compliance. Combined with TrueConfig's continuous monitoring, you can demonstrate ongoing adherence to ISO 27001 requirements.
Ready to achieve ISO 27001 compliance?
TrueConfig continuously monitors your Microsoft 365 tenant for compliance with ISO 27001 requirements, including this control.