EIDTNT-003: Guest User Access Restrictions
- Plataforma
- Entra ID / M365
- Categoría
- Entra ID Tenant Configuration
- Severidad
- High
- Pilar de Zero Trust
- Governance (peso 2)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
Guest users are external identities invited to collaborate with the organization. By default, guest users may have overly broad visibility into the directory, including the ability to enumerate users, groups, and applications. Unrestricted guest access allows external parties to map the organization's identity structure, identify high-value targets, and gather intelligence for subsequent attacks. Guest permissions should be restricted to the minimum required for collaboration.
Valor recomendado
Guest user access restricted to properties and memberships of their own directory objects only
Remediación
Navigate to Entra ID > External Identities > External collaboration settings and review the guest user access restrictions. Set guest user access to the most restrictive option that limits guests to properties and memberships of their own directory objects. Verify that guests cannot enumerate the full user list, group memberships, or application registrations by testing with a guest account.
Veredictos probados con fixtures
Cada veredicto de esta tabla está probado por un fixture de referencia en la suite de pruebas que valida el módulo. La tabla se deriva de la última ejecución en verde; no puede editarse a mano.
| Escenario | Veredicto esperado |
|---|---|
| clean | PASS |
| known-bad | FAIL |
| no-data | Not Assessed |
Mapeos a marcos de referencia
- CISA SCuBA
- MS.AAD.8.1v1
- NIST SP 800-53
- AC-14
- CIS M365 Benchmark
- 1.3.1
- MITRE ATT&CK
- T1078.004