Microsoft Teams To Give Administrators Greater Control Over Dangerous File Attachments

Microsoft is preparing to expand security controls in Microsoft Teams by allowing administrators to decide which file extensions should be blocked from chats and channels, giving organisations more control over how the collaboration platform handles potentially dangerous attachments.

The forthcoming capability extends Teams’ existing Weaponizable File Protection system, which prevents users from sending files with extensions commonly associated with malware, scripts and executable content. Until now, Microsoft has maintained the list of restricted extensions, leaving administrators unable to adapt it to their organisation’s particular risks or operational requirements.

According to Microsoft , administrators will soon be able to customise which file types Teams blocks or continue using Microsoft’s recommended default list. The change is currently described as being in development, with general availability scheduled for November 2026.