Microsoft Teams: Malicious URL Protection for Teams Chat and Channels

Microsoft Teams will introduce malicious URL protection in chats and channels, warning users about phishing links. Rolling out from September to November 2025, the feature requires admin activation during preview and will be on by default at general availability. It scans URLs using Microsoft Defender reputation data. Microsoft Teams is introducing enhanced protection against phishing attacks by detecting and warning users about malicious URLs shared in Teams chats and channels. This feature helps users make safer decisions before clicking potentially harmful links. This message applies to Teams for Windows desktop, Teams for Mac desktop, Teams for the web, and Teams for iOS/Android. This message is associated with Roadmap ID 499893. When this will happen Targeted Release (Worldwide): Rollout begins early September 2025 and is expected to complete by mid-September 2025. General Availability (Worldwide): Rollout begins early November 2025 and is expected to complete by mid-November 2025. How this affects your organization View image in new tab When a malicious link is detected, Teams will automatically display a warning to both the sender and recipient. This helps reduce the risk of phishing attacks. Targeted Release: Link protection is applied only when all participants in the conversation have the feature enabled. General Availability: Link protection is enforced if at least one participant in the conversation has the feature enabled. Targeted release vs. General Availability behavior: Targeted release: Link protection is applied only when all organizations in the conversation have the feature enabled. This feature is off by default and requires admin activation. General Availability: Link protection is applied if at least one participant has the feature enabled. This feature is on by default. Admin settings saved during Targeted Release will remain unchanged.  What you can do to prepare During Public Preview, administrators must manually enable the feature: Go to the Teams Admin Center Navigate to Messaging Settings Enable the setting: Scan messages for unsafe URLs View image in new tab This setting is also available via Set-CsTeamsMessagingConfiguration PowerShell cmdlet –UrlReputationCheck parameter. No action is required once the feature reaches General Availability, as it will be turned on by default. Learn more: Weaponizable […]

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