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MC1148540 — New file protection in Teams chat and channels blocks unsafe content

MC1148540Microsoft TeamspreventOrFixIssueUpdated: 17 November 2025

Microsoft Teams will block messages containing weaponizable file types (e.g., executables) in chats and channels starting November 2025, enhancing security by preventing unsafe content sharing. The feature will be on by default at General Availability, with admins able to configure settings via the Teams Admin Center or PowerShell.

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Applies to: Microsoft Teams
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).