check before: 2026-01-12
Product:
Defender, Defender for Office 365, Defender XDR, Entra, Microsoft 365 admin center, Microsoft 365 Apps, Teams, Windows
Platform:
Android, iOS, Mac, Online, Web, Windows Desktop, World tenant
Status:
Launched
Change type:
Feature update, Admin impact
Details:
Summary:
Starting January 12, 2026, Microsoft Teams will enable messaging safety features by default, including weaponizable file type protection, malicious URL protection, and reporting incorrect detections. Existing custom settings remain unchanged. Admins should review and adjust settings before this date and inform helpdesk staff accordingly.
Details:
[Introduction]
We're improving messaging security in Microsoft Teams by enabling key safety protections by default. This update helps safeguard users from malicious content and provides options to report incorrect detections, reducing risk and improving collaboration security.
[When this will happen:]
Starting January 12, 2026, as announced in MC1148540, MC1148539, and MC1147984.
Change Category:
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Scope:
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Release Phase:
Standard Release, Targeted Release
Created:
2025-12-20
updated:
2025-12-20
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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linked item details
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summary for non-techies**
Starting January 12, 2026, Microsoft Teams will automatically enable messaging safety features like blocking dangerous file types and warning about harmful links, with options for users to customize these settings if desired.
Direct effects for Operations**
Weaponizable File Type Protection
Users may experience blocked messages containing weaponizable file types, leading to disruptions in communication and collaboration.
- roles: End Users, Helpdesk Staff
- references: https://learn.microsoft.com/microsoftteams/weaponizable-file-protection-teams
Malicious URL Protection
Users will see warning labels on messages containing malicious URLs, which may cause confusion and hinder workflow if not communicated properly.
- roles: End Users, Helpdesk Staff
- references: https://learn.microsoft.com/microsoftteams/malicious-url-protection-teams
Reporting Incorrect Detections
Users may report false positives, which could lead to increased workload for helpdesk staff if they are not prepared to handle these reports.
- roles: End Users, Helpdesk Staff
- references: https://learn.microsoft.com/microsoftteams/end-user-reporting-security#user-experience-in-teams--report-not-a-security-concern
Configutation Options**
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Opportunities**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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Last updated 3 days ago ago
