The Safe Links feature is an additional security protection in Defender for Office 365, which is intended for business customers who have Microsoft Defender for Office 365. Reverting said additions was enough to fix the issue, Microsoft said.
The company later said that some "recent additions to the SafeLinks feature" resulted in the false alerts experienced by admins around the world. Microsoft was soon obliged to acknowledge the issue, stating that they were investigating the incident and the fact that some of the alerts were "not showing content as expected." The incident, which is being tracked as DZ534539, was seemingly affecting hundreds of accounts worldwide.Īfter reviewing diagnostic data such as network telemetry, Microsoft was finally able to identify the root cause for the issue. The portal itself was working intermittently, the users said. Users and admins complained that links coming from Zoom or even Google services were being flagged as a potential security threat, which triggered a flow of security alerts to the Microsoft 365 Admin Center portal. This time, system administrators have been flooded with security warnings regarding legitimate URL links, which were "incorrectly" flagged as malicious by the Defender service. Microsoft Defender is once again turning its "security" protection against legit features. Which can be a real nuisance, as the AV tends to act weird every now and then.
In context: Born as a Windows-specific antimalware program, Microsoft Defender is now a brand encompassing many security services for Windows, the cloud, and Office applications.
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