Microsoft Teams to Let Admins Customize Blocked File Types
Summary
Microsoft plans to let Teams admins customize file types blocked by Weaponizable File Protection, with rollout scheduled to begin in November 2026. The article also outlines other Teams features aimed at phishing, fraud, social engineering, and external bots.
Key points
- Teams admins will be able to customize which file extensions Weaponizable File Protection blocks or keep Microsoft's recommended default list.
- The feature scans Teams conversations and blocks messages containing dangerous, high-risk attachments.
- The customizable file-blocking feature is in development, with rollout scheduled to begin in November 2026 across Android, desktop, iOS, macOS, and web.
- Starting in December, admins will be able to block external users through the Defender portal to help counter social engineering attacks.
- Teams is adding a feature to blur QR codes sent by external senders as protection against phishing and fraud.
- Users will be able to report suspicious guest invitations directly in Teams, and a meeting policy is rolling out to block identified external bots.
Article Details
- Event Type
- Microsoft Teams security feature updates
- Impact
- Administrators will be able to customize file extensions blocked by Weaponizable File Protection, which scans chats and blocks messages with dangerous attachments. Microsoft also announced controls to block external users and bots, blur QR codes from external senders, and report suspicious guest invitations. The file-extension update is in development and is scheduled to begin rolling out in November 2026.
Vendors
Products
Defender#MicrosoftTeamsMicrosoft TeamsMicrosoft Teams will soon let administrators customize the file extensions blocked by Weaponizable File Protection, giving organizations more control over which attachments are treated as high-risk.Weaponizable File ProtectionMicrosoft Teams will soon let administrators customize the file extensions blocked by Weaponizable File Protection, giving organizations more control over which attachments are treated as high-risk.