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

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

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

Nightmare Eclipse has dropped ShieldBreak, a Windows zero-day exploit that allows any user to gain System privileges.

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

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

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

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

For most people using a supported and fully updated Windows 11 computer, yes: Microsoft Defender Antivirus and the other protections inside Windows Security are sufficient as the primary antivirus.

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

How I free up Windows disk space and shred sensitive data for free with open-source BleachBit ...

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