Paris Soir - Microsoft Teams Admins Gain New Control to Block External Meeting Bots

Microsoft is implementing a critical security enhancement for Microsoft Teams that allows administrators to automatically prevent external bots from joining meetings. This update represents a significant shift in the platform's approach to managing third-party applications, moving from passive identification to active prevention.

Previously, when an external bot attempted to enter a meeting, the software would identify the application and label it within the virtual lobby. However, the final decision to allow or deny entry rested entirely with the meeting organizer. The new policy removes this burden by blocking these bots at the point of entry, thereby reducing the security risks associated with unwanted participants.

The initiative responds to a documented rise in cybercriminal activity targeting video conferencing platforms. Meera Ajam, writing in a June post, highlighted the changing nature of digital meetings, noting that "bots have begun joining meetings that participants never intended them to attend." This observation points to a broader shift toward hybrid environments where human and machine participants coexist.

Despite the security benefits, Microsoft has chosen to disable this blocking policy by default. The company acknowledges that aggressive filtering could inadvertently block legitimate tools essential for productivity. These include AI meeting assistants, transcription services, recording add-ons, and other similar utilities that rely on external bot integration. By keeping the feature off initially, Microsoft allows organizations to evaluate their specific needs before enforcing restrictions.

Administrators retain the flexibility to enable the policy for specific users or groups as needed. This targeted approach aims to reduce security burdens without disrupting workflows that depend on third-party integrations. The update also lays the groundwork for additional administrative controls, including allow lists for approved bots and comprehensive audit logs, which are scheduled to follow in subsequent releases.

This development marks a major improvement over earlier bot protections introduced just two months ago. While the current rollout provides the foundational ability to block external entities, it stops short of a blanket ban on third-party applications. Microsoft expects the general availability of this feature by late September, giving organizations time to prepare for potential implementation.

The update underscores Microsoft's ongoing efforts to balance security with usability in its productivity suite. As cyber threats evolve, providing administrators with precise tools to manage external access becomes increasingly vital. The default-disabled status reflects a cautious approach, prioritizing organizational autonomy over immediate universal enforcement.

K.Laurent--PS