502879 – Microsoft Defender for Office 365: Message Warnings for Messages with Malicious URL in Teams

Product:

Defender, Defender for Office 365, Teams

Platform:

Android, iOS, Web, Windows Desktop, World tenant

Status:

Launched

Change type:

Links:

MC1150984

Details:

Messages in Teams that contain malicious URLs will now be automatically detected, and a warning will be displayed directly on the message.

Change Category:
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Scope:
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Release Phase:
General Availability, Preview

Created:
2025-09-10

updated:
2025-12-18

Public Preview Start Date

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Docu to Check

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MS workload name

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summary for non-techies**

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Direct effects for Operations**

Please, look at the most relevant linked item for details

explanation for non-techies**

Imagine you are hosting a party at your house. You want to make sure that only invited guests come in, so you have a security guard at the door checking invitations. Now, think of Microsoft Teams as your house, and the messages with links as the guests trying to enter. Microsoft Defender for Office 365 acts like that security guard, ensuring that any message containing a potentially harmful link is flagged before it can cause any trouble.

When a message in Teams includes a URL that could be dangerous, Microsoft Defender steps in to automatically detect it. It then places a warning directly on the message, much like a security guard might stop a guest to check their credentials more closely. This warning serves as a heads-up to users, alerting them that the link might not be safe to click on. It's like having a "proceed with caution" sign on a door that might lead to a room with a slippery floor.

This change is beneficial for users across different platforms, whether they're using Teams on Android, iOS, desktop, or the web. It's like having a security system that works seamlessly no matter which entrance your guests use to come into the party. By doing this, Microsoft Defender helps protect users from potential threats without them needing to do anything extra. It’s a way of ensuring peace of mind, much like knowing your security guard is on duty, keeping an eye out for any uninvited troublemakers.