M365TEAMS-004: Anonymous meeting join settings
- Plataforma
- Entra ID / M365
- Categoría
- Microsoft Teams Security
- Severidad
- High
- Pilar de Zero Trust
- Applications & Workloads (peso 2)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
Anonymous meeting join allows anyone with a meeting link to join Teams meetings without authentication, making it impossible to verify the identity of participants. This setting is frequently exploited in meeting bombing attacks where uninvited participants join to disrupt meetings or eavesdrop on confidential discussions. Disabling anonymous join or requiring all participants to authenticate significantly improves meeting security.
Valor recomendado
Anonymous meeting join disabled; all meeting participants required to authenticate; lobby enabled for unauthenticated users
Remediación
Disable anonymous meeting join in the Teams meeting policy to require all participants to sign in before joining meetings. If anonymous join must be allowed for specific use cases such as public webinars, create a separate meeting policy with anonymous join enabled and assign it only to the users who need it. Enable the lobby for all external and guest participants and configure meeting organizers to manually admit attendees from the lobby.
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 |
| throttled | Not Assessed |
Mapeos a marcos de referencia
- CISA SCuBA
- MS.TEAMS.1.2v2, MS.TEAMS.1.3v1
- NIST SP 800-53
- AC-14
- CIS M365 Benchmark
- 8.5.2