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Wire · opportunities

Nightmare Eclipse bypasses Microsoft patch with new Defender exploit

12 August 2026 · By · Wire by Fusion42

Published

12 August 2026

Topic

opportunities

◆ Sectors

Cybersecurity

◆ Geography

United States

◆ Source

Read at cybernews.com →

◆ Verified

Fusion42 · 12 August 2026 · Fusion42 review

A security researcher named Nightmare Eclipse released ShieldBreak, a new zero-day exploit that bypasses Microsoft's patch for CVE-2026-50656, enabling SYSTEM-level privilege escalation on fully patched Windows 11 and Windows Server 2025 systems.

This Wire brief sits within Fusion42's coverage of Cybersecurity, and 3 sources have reported it between 12 Aug 2026 and 17 Aug 2026.

◆ ◆ The Wire takeaway

You face an urgent threat from a new Defender exploit that completely bypasses Microsoft's patch, forcing you to reassess your Windows security tools immediately or risk elevated attacks on your systems.

◆ Coverage

3 sources · first reported 12 Aug 2026 · latest 17 Aug 2026

◆ Related on Wire

◆ Topics

Cybersecuritymicrosoftwindows-defenderzero-dayprivilege-escalationcybersecurity