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Microsoft Defender False Alarm Warnings Hit Windows Devices

Guavy AI Editorial Team Published August 31, 2026

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MSFT

Microsoft's built-in security solution, Microsoft Defender, is causing false alarm warnings on Windows 10 and 11 devices.

The issue stems from a recent antivirus update bug that has been affecting multiple versions of Windows, including Windows 10 (versions 22H2, 21H2, Enterprise LTSC 2019, Enterprise LTSC 2016) and Windows 11 (versions 26H1, 25H2, 24H2, and 23H2).

According to Microsoft, the bug causes notifications to appear stating that 'Microsoft Defender Antivirus is turned off,' even though the antivirus is functioning correctly.

The issue persists even if notification settings are turned off, and it can appear when Windows starts and intermittently afterward.

Fortunately, Microsoft has acknowledged the problem and is working on a fix expected to be released in an upcoming update. In the meantime, users should not panic as their devices remain secure.

Microsoft Defender False Alarm Warnings Hit Windows Devices

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