Redazione RHC : 12 September 2025 14:17
To strengthen the security of its Teams platform, Microsoft will implement an automatic notification system to users regarding dangerous links in chat messages. This new feature, integrated into Microsoft Defender for Office 365, has the primary goal of protecting users from phishing, spam, and malware by identifying potentially malicious URLs exchanged both within and outside of conversations.
Links are examined by the system and compared against Microsoft Defender’s threat intelligence and machine learning detection engines to determine if they pose a risk.
The public preview update will begin rolling out to enterprise customers in early September 2025. General availability worldwide will be completed by mid-November 2025. The feature will be available on Microsoft Teams across desktop, web, Android, and iOS platforms. iOS.
When a user receives a message containing a flagged URL, an explicit warning appears directly in the chat, informing them that the link could pose a security risk. At the same time, the notification system also informs the sender that the shared link has been identified as potentially dangerous, giving them the option to correct or delete the message.
If a link is flagged as malicious within 48 hours of being presented, the system will retroactively apply a warning message to the message, through a process commonly known as Zero-hour auto purge (ZAP).
The system Innovative alerting integrates with the security measures already in place in the Microsoft 365 environment. Its functionality combines with that of Safe Links, a feature of Microsoft Defender for Office 365 that performs time-of-click verification to protect users from malicious links. The new warning messages provide a preemptive level of protection, informing users before they interact with the URL, unlike Safe Links, which only provides protection when a link is clicked.
The Malicious URL Protection feature will be enabled by default once it becomes generally available in November 2025. During the public preview period starting in September 2025, administrators will need to opt-in to enable warnings.
IT administrators can manage the feature’s settings through the Teams admin center, under the “Messaging Settings” section, or through PowerShell commands. This allows organizations to configure protection based on their specific security policies.
Administrators are encouraged to review these settings, update internal documentation, and inform their support teams about new features to ensure a smooth implementation.
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