MT.1046: Restrict anonymous users from joining meetings
| ID | MT.1046 |
| Severity | Medium |
| Suite | Mito |
| Product | Teams |
| Feature | Meetings |
| Security area | External access and sharing |
| Resource type | Tenant |
| User impact of fixing | Medium |
| Effort to fix | Low |
| Framework controls | nist-800-53-r5:AC-3 Access Enforcement |
| Reads from | Microsoft Teams |
What this checks and how to fix it
Section titled “What this checks and how to fix it”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
Section titled “Remediation action”- Open Meeting policies in the Teams admin center.
- Select the Global (Org-wide default) policy.
- Set Anonymous users can join a meeting to Off.
- Select Save.
Or with PowerShell: Set-CsTeamsMeetingPolicy -Identity Global -AllowAnonymousUsersToJoinMeeting $false
Related links
Section titled “Related links”Mito check. Author: weyCC81; contributors: merill, svrooij. Open-source licences.
Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).
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