The 'ShieldBreak' flaw can let an attacker use Windows Defender to escalate their privileges on the OS. Microsoft previously threatened legal action against the researcher, Nightmare Eclipse.

This is the latest zero-day released by security researcher Nightmare Eclipse, despite Microsoft publicly threatening to take legal action against them.

Nightmare Eclipse has released a new Microsoft Defender zero-day exploit named "ShieldBreak" after Microsoft released the August 2026 Patch Tuesday security updates.

Microsoft today announced that Windows Defender Advanced Threat Protection (ATP) will include seamless integration across the entire Windows threat protection stack and its reach will extend to ...

A newly disclosed Microsoft Defender vulnerability, dubbed SheildBreak, could allow attackers to gain full system access. The ...

This voice experience is generated by AI. Learn more. This voice experience is generated by AI. Learn more. Microsoft and CISA confirm Defender zero-days exploited in the wild. Microsoft has started ...

Microsoft released a new Defender update for Windows 11,10, and Server installation images. It patches backdoors, ransomware, and more. Microsoft published a new Defender update for Windows ...

Learn how BitLocker, passkeys, Microsoft Defender, and other Windows 11 security features protect your data, accounts, apps, and devices.