vulnerability
ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access
High
Summary
A security researcher, Chaotic Eclipse, has released a proof-of-concept (PoC) demonstrating a patch bypass for a Microsoft Defender zero-day vulnerability, dubbed ShieldBreak. This vulnerability, CVE-2026-50656 (RoguePlanet), allows an attacker to gain SYSTEM-level privileges, potentially enabling them to execute arbitrary code and perform unauthorized actions. While Microsoft released a patch in July 2026, the PoC demonstrates a complete bypass, and CISA has added the vulnerability to its KEV catalog for federal agencies.
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