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Windows Security app displaying a false Microsoft Defender Antivirus turned off warning

AdvisoryMicrosoft Defender Antivirus

Microsoft Tells Users to Ignore False 'Antivirus Is Turned Off' Alerts

Microsoft has confirmed a known issue in which recent Microsoft Defender Antivirus updates trigger false "Microsoft Defender Antivirus is turned off" alerts in the Windows Security app, even though the antivirus is running normally. The bug affects all supported Windows client and server versions, including Windows 11 26H1 and Windows Server 2025, and a fix is still pending.

Sep 2, 20266 min read

Browser warning screen reading Opening this website might not be safe over a Google search results page

OutageMicrosoft Defender for Office 365

Microsoft Defender Flags Legitimate Google Search Links as Malicious

Microsoft is investigating a Defender for Office 365 Safe Links misclassification that blocks legitimate Google search URLs, showing "Opening this website might not be safe" warnings across affected tenants.

Sep 2, 20265 min read

Microsoft Defender patching the RoguePlanet zero-day vulnerability, CVE-2026-50656, through a security engine update.

MitigatedMicrosoft Defender

Microsoft Patches "RoguePlanet" Defender Zero-Day (CVE-2026-50656) via Engine Update

Microsoft has released Malware Protection Engine 1.1.26060.3008 to fix "RoguePlanet" (CVE-2026-50656), a Microsoft Defender race-condition zero-day that a researcher using the "Nightmare Eclipse" handle said could grant SYSTEM privileges on fully patched Windows 10 and 11 devices.

Jul 11, 20265 min read