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ShieldBreak is a Windows Defender bypass exploit demonstrating a patch bypass for the RoguePlanet vulnerability (CVE-2026-50656). It uses Cloud Files API callbacks during file scanning to achieve 100% success rate on Windows 11 and Server 2025.
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README.md

ShieldBreak - Windows Defender 0day vulnerability

Microsoft has failed to properly patch the RoguePlanet vulnerability CVE-2026-50656, this PoC demonstrates a full patch bypass.

Untitled

The PoC was tested in the latest version of windows 11 25h2 (+Canary channel) and windows server 2025, the PoC also have a 100% success rate. Please note that Windows 10 (and respective server editions) are not currently supported, they are however vulnerable to ShieldBreak as well.