EIDTNT-010: Custom Domain Configuration
- Platform
- Entra ID / M365
- Category
- Entra ID Tenant Configuration
- Severity
- Info
- Zero Trust pillar
- Governance (weight 1)
- Golden fixtures
- 3
- Branch coverage
- Observed: fixtures prove the verdicts they exercise
- Provenance
- baseline
What it checks
Custom domains registered in the tenant define the email address and sign-in suffixes used by the organization. Unverified or unauthorized domains may indicate misconfiguration or an attacker attempting to establish a presence in the tenant. Each custom domain should be verified through DNS records and periodically reviewed to ensure all domains are still owned by the organization and that DNS verification records remain intact.
Recommended value
All custom domains verified, actively managed, and with DNS verification records intact
Remediation
Review all custom domains registered in Entra ID > Custom domain names and verify that each domain is still owned by the organization and that DNS verification records are properly configured. Remove any domains that are no longer in use or that cannot be verified as organization-owned. Ensure that domain DNS registrations are protected with registrar locks and that domain expiration dates are monitored to prevent unintentional domain loss.
Fixture-proven verdicts
Every verdict below is proven by a golden fixture in the module's gating test suite. This table derives from the last green run; it cannot be edited by hand.
| Scenario | Expected verdict |
|---|---|
| clean | PASS |
| known-bad | WARN |
| no-data | Not Assessed |
Framework mappings
- NIST SP 800-53
- CM-8
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