Researcher discloses zero-day flaw in Windows Defender

Abdelhamid Naceri releases an exploit blocking updates for Microsoft Defender antivirus.

Published 7sem2 sources✓ ConfirmedNotableupdated 6sem

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The fact

The unpatched flaw allows disabling protections without user action.

Microsoft has not yet responded to this public disclosure.

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Auto-synthesis from 2 media sources · identified on September 22, 2026