MT.1046 - Restrict anonymous users from joining meetings

Contributed by Stefan Wey with 2 co-contributorsAll contributors →

Overview

Anonymous users should not be able to join Teams meetings.

By restricting anonymous users from joining Microsoft Teams meetings, you have full control over meeting access. Anonymous users may not be from your organization and could have joined for malicious purposes, such as gaining information about your organization through conversations.

This test checks the AllowAnonymousUsersToJoinMeeting 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 can join a meeting to Off.
4. Select Save.

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

Related links

• Manage meeting policies in Microsoft Teams - Microsoft Learn

Test Metadata

Field	Value
Test ID	MT.1046
Severity	Medium
Suite	Maester
Product	Teams
Feature	Meetings
Area	External access and sharing
Resource type	Tenant
User impact	Medium
Implementation cost	Low
MITRE ATT&CK	None
Supports controls	nist-800-53-r5:AC-3
PowerShell test	Test-MtCheckMT1046
Services	Teams

Source

• Test: tests/maester/teams/Test.MT.1046.ps1
• Documentation: tests/maester/teams/Test.MT.1046.md