Microsoft Teams: External presenter support for event group chat

🚨 The Signal: Microsoft Teams event group chats now include external presenters. This expands the scope of private communication channels to external parties, increasing potential for information exposure if not managed.

The Impact

External presenters can now access private event chats, increasing the risk of unintended information disclosure to non-organizational members.

• Security Teams: Increased risk of data leakage to external parties.
• Admins: Need to review and enforce external sharing policies for Teams.
• Organizers: Must be aware of external presenter access to private chats.
• External Presenters: Gain access to internal event discussions.

The Action

1. Review and enforce existing Microsoft Teams external access policies in the Teams admin center.
2. Educate event organizers on the implications of adding external presenters to private chats.
3. Monitor Teams audit logs for external user activity in event chats.
4. Consider implementing sensitivity labels for event-related chats containing sensitive information.

Domain: Teams · Impact: medium · Workload: Teams