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New Microsoft Defender 'ShieldCrash' zero-day grants SYSTEM access

BleepingComputer·September 9, 2026·1 min read
New Microsoft Defender 'ShieldCrash' zero-day grants SYSTEM access

An anonymous researcher known as Nightmare Eclipse released a Microsoft Defender zero-day exploit named 'ShieldCrash' that grants SYSTEM access, just after September 2026 Patch Tuesday updates. The exploit targets a vulnerability in the security software, posing immediate risk to unpatched systems.

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