MT.1047 - Restrict anonymous users from starting Teams meetings

Contributed by Stefan Wey with 2 co-contributorsAll contributors →

Overview

Anonymous users should not be able to start Teams meetings.

If anonymous users are allowed to start meetings, they can admit any users from the lobbies, authenticated or otherwise. Anonymous users haven’t been authenticated, which can increase the risk of data leakage.

This test checks the AllowAnonymousUsersToStartMeeting setting of the Global (Org-wide default) Teams meeting policy.

Remediation action

1. Open Meeting policies in the Teams admin center.
2. Select the Global (Org-wide default) policy.
3. Set Anonymous users and dial-in callers can start a meeting to Off.
4. Select Save.

Or with PowerShell: Set-CsTeamsMeetingPolicy -Identity Global -AllowAnonymousUsersToStartMeeting $false

Related links

• Manage meeting policies in Microsoft Teams - Microsoft Learn

Test Metadata

Field	Value
Test ID	MT.1047
Severity	Medium
Suite	Maester
Product	Teams
Feature	Meetings
Area	External access and sharing
Resource type	Tenant
User impact	Low
Implementation cost	Low
MITRE ATT&CK	None
Supports controls	nist-800-53-r5:AC-3
PowerShell test	Test-MtCheckMT1047
Services	Teams

Source

• Test: tests/maester/teams/Test.MT.1047.ps1
• Documentation: tests/maester/teams/Test.MT.1047.md