{"id":1103,"date":"2026-09-27T01:44:18","date_gmt":"2026-09-27T01:44:18","guid":{"rendered":"https:\/\/localseobot.ai\/blog\/microsoft-defender-flags-google-search-links-malicious\/"},"modified":"2026-10-12T12:37:03","modified_gmt":"2026-10-12T12:37:03","slug":"microsoft-defender-flags-google-search-links-malicious","status":"publish","type":"post","link":"https:\/\/localseobot.ai\/blog\/microsoft-defender-flags-google-search-links-malicious\/","title":{"rendered":"Microsoft Defender flags legitimate Google search links as malicious"},"content":{"rendered":"

Microsoft Defender for Office 365 Safe Links blocked legitimate Google search URLs after an inaccurate security classification misidentified them as malicious, leaving users unable to open links without seeing a warning. Microsoft confirmed the misclassification and moved to correct it, then reported that the issue had been resolved while noting that some users could still see residual impact as the fix propagated.<\/p>\n

IT administrators saw alerts in the Microsoft Defender portal and Microsoft Sentinel linked to the same detection rule, which made the false positives visible across both security surfaces at once.<\/p>\n

What users saw<\/h2>\n

Users encountered the message “Opening this website might not be safe” when they tried to open a Google search link from an email, a Teams message, or an Office 365 app protected by Defender for Office 365 Safe Links. The warning fired even though the underlying URL pointed at a normal Google search results page.<\/p>\n

Copying the link and pasting it directly into a browser did not get around the warning, because the block was tied to the URL pattern itself rather than to a specific browser session.<\/p>\n

Why the blocks happened<\/h2>\n

Safe Links is the Defender for Office 365 feature that rewrites inbound links during mail flow, then performs a time-of-click check on every URL the user opens from email, Teams, and Office 365 apps. When that time-of-click check returns a malicious verdict, the user is shown the warning page instead of the destination.<\/p>\n

In this case, the verdict came from an inaccurate security classification applied to a broad set of Google search URLs, so a large number of legitimate links inherited the same block. Microsoft acknowledged that the classification, not the URL content, was the root cause.<\/p>\n

Scope and severity<\/h2>\n

Microsoft did not disclose which regions were affected or how many customers ran into the issue, and it filed the incident under incident ID MO1465962. The company classified the problem as an advisory, a category Microsoft generally uses for service issues with limited scope or impact.<\/p>\n

Because Safe Links applies inside any organization holding a Defender for Office 365 license, the false positive reached every tenant whose policy was active during the window, regardless of industry or region.<\/p>\n

Microsoft’s response and resolution<\/h2>\n

Microsoft’s public service alert confirmed the false positive and said the team was working to correct the misclassification. A follow-up update stated that the issue had been successfully resolved, with a note that some users could still see impact for a limited time while the mitigation propagated through the service infrastructure.<\/p>\n

Administrators monitoring Defender and Sentinel saw the wave of related alerts during the incident and then saw the alerts taper off as the corrected classification rolled out.<\/p>\n

Pattern of recent false positives<\/h2>\n

Microsoft 365 has misclassified emails in several recent incidents.<\/p>\n