Microsoft Teams: Two presenters can share their screens or windows simultaneously in meetings

🚨 The Signal: Microsoft Teams now allows two presenters to share screens simultaneously in meetings. This increases the attack surface for accidental or malicious data exposure, as more content is visible concurrently.

The Impact

All meeting participants are affected by the increased risk of sensitive data exposure during dual screen sharing.

• End Users: Increased risk of inadvertently sharing sensitive data from two sources.
• Security Teams: New vector for data exfiltration or accidental disclosure to monitor.
• Admins: Need to review and update meeting policies to mitigate dual-sharing risks.

The Action

1. Review existing Microsoft Teams meeting policies for content sharing restrictions.
2. Consider implementing sensitivity labels for meetings where highly sensitive data might be shared.
3. Educate users on the risks of dual screen sharing and best practices for protecting sensitive information.
4. Monitor Teams audit logs for unusual sharing activities, especially in sensitive meetings.

Domain: Teams · Impact: medium · Workload: Teams