Maayan Sela

ShieldBreak: The Windows Defender 0-Day with No Patch — And What to Do About It.

A public proof-of-concept called ShieldBreak fully bypasses Microsoft's patch for the Windows Defender privilege-escalation flaw known as RoguePlanet (CVE-2026-50656, CVSS 7.8), letting an attacker who already has local code execution reach a SYSTEM-level shell on Windows 11 25H2 and Windows Server 2025 with a reported 100% success rate. No Microsoft fix currently closes this bypass. Deploy the interim mitigation in the Guardian dashboard and hunt for the associated exploitation indicators until one ships.