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Sep 22 2026 New Windows Defender zero-day blocks Microsoft antivirus updates

Source

Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates. [...]

Posted by Sergiu Gatlan on Tue 22 September 2026 in BleepingComputer.

Tags: Security, Microsoft.

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