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Date	Provider	Score	Summary
12 Aug 2026, 2:41 PM	The Hacker News	4.5	ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access A researcher going by 'Chaotic Eclipse' has published a proof-of-concept called ShieldBreak that claims to fully bypass Microsoft's patch for CVE-2026-50656 (RoguePlanet), a race condition in the Microsoft Defender Malware Protection Engine (mpengine.dll) that can grant SYSTEM-level privileges. The PoC reportedly has a 100% success rate on Windows 11 25H2 and Windows Server 2025, with Windows 10 also vulnerable but untested. Microsoft says it is investigating the patch bypass claim. Why: If you run Windows 11 25H2 or Windows Server 2025 in production or dev environments, this PoC means the existing Defender patch for CVE-2026-50656 does not actually protect you — an attacker with local access can still escalate to SYSTEM. Treat Defender's patch as insufficient and add compensating controls (restrict local user privileges, monitor for unexpected child processes from Defender's engine) until Microsoft ships a corrected patch. security windows privilege-escalation microsoft-defender zero-day

Date

Provider

Score

Summary

12 Aug 2026, 2:41 PM

The Hacker News

4.5

ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access

A researcher going by 'Chaotic Eclipse' has published a proof-of-concept called ShieldBreak that claims to fully bypass Microsoft's patch for CVE-2026-50656 (RoguePlanet), a race condition in the Microsoft Defender Malware Protection Engine (mpengine.dll) that can grant SYSTEM-level privileges. The PoC reportedly has a 100% success rate on Windows 11 25H2 and Windows Server 2025, with Windows 10 also vulnerable but untested. Microsoft says it is investigating the patch bypass claim.

Why: If you run Windows 11 25H2 or Windows Server 2025 in production or dev environments, this PoC means the existing Defender patch for CVE-2026-50656 does not actually protect you — an attacker with local access can still escalate to SYSTEM. Treat Defender's patch as insufficient and add compensating controls (restrict local user privileges, monitor for unexpected child processes from Defender's engine) until Microsoft ships a corrected patch.