MT.1048 - Limit external participants from having control in a Teams meeting

Contributed by Stefan Wey with 2 co-contributorsAll contributors →

Overview

External participants should not be able to give or request control in Teams meetings.

External participants are users that are outside your organization. Limiting their permission to share content, add new users, and more protects your organization’s information from data leaks, inappropriate content being shared, or malicious actors joining the meeting.

This test checks the AllowExternalParticipantGiveRequestControl 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 External participants can give or request control to Off.
4. Select Save.

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

Related links

• Manage meeting policies in Microsoft Teams - Microsoft Learn

Test Metadata

Field	Value
Test ID	MT.1048
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-6
PowerShell test	Test-MtCheckMT1048
Services	Teams

Source

• Test: tests/maester/teams/Test.MT.1048.ps1
• Documentation: tests/maester/teams/Test.MT.1048.md