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

The 'ShieldBreak' flaw can let an attacker use Windows Defender to escalate their privileges on the OS. Microsoft previously ...

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

ShieldBreak is a claimed patch bypass for Defender flaw CVE-2026-50656, with a PoC tested on Windows 11 25H2 and Server 2025.

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

Microsoft Defender automatically isolated a compromised QNET endpoint in 129 seconds, stopping a multi-stage attack before the payload could persist or spread.

Two different Windows flaws popped up this week. What connects them is that both could give bad actors system privileges.

Microsoft says a new Defender capability isolated a compromised device and stopped a ransomware attack in 128 seconds.

The Windows firewall is a fine place to start, but there are better options.

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A hands-on Windows 11 experiment finds that most ancient malware is harmless, but some decades-old threats can still slip past Defender.

CISA confirmed today that ransomware gangs have begun abusing a high-severity Microsoft SharePoint remote code execution ...