Researcher Drops New Microsoft Defender PoC Showing ShieldBreak Patch Can Be Bypassed

Security researcher Chaotic Eclipse has released a proof-of-concept named ShieldCrash that exploits an incomplete remediation for CVE-2026-69414 in Microsoft Defender. This new exploit effectively bypasses the patch for the previously disclosed ShieldBreak vulnerability, allowing for arbitrary file reads with SYSTEM privileges across all supported Windows desktop versions. Although Microsoft recently updated the Microsoft Malware Protection Engine to version 1.1.26080.3 to address the initial flaw, this new finding indicates that certain code paths remain vulnerable under specific conditions.