Microsoft Teams: Events now support up to 20,000 registrations, making it easier to reach and engage larger audiences at scale

🚨 The Signal: Microsoft Teams Events now support up to 20,000 registrations. This increases the potential attack surface for social engineering and phishing campaigns targeting large audiences, requiring enhanced vigilance.

The Impact

Event organizers and attendees are affected, facing increased risk from large-scale social engineering and data privacy concerns.

• Event Organizers: Increased risk of data exposure and compliance breaches due to larger attendee lists.
• Attendees: Higher exposure to phishing and social engineering attacks targeting large event participants.
• Security Teams: Greater challenge in monitoring and responding to security incidents across a larger event footprint.

The Action

1. Review and enforce Microsoft Teams event policies for external access and guest participation.
2. Implement robust pre-registration validation and attendee verification processes.
3. Educate event organizers on social engineering risks and secure event configuration.
4. Ensure data handling and privacy policies are updated for large-scale event data.
5. Monitor event chat and Q&A for malicious links or content.

Domain: Teams · Impact: medium · Workload: Teams