ShieldBreak: Windows Zero-Day That Breaks Microsoft's RoguePlanet Fix
Brief
Key Findings
Tenth tool in an escalating grudge match between the researcher and Microsoft that began in April 2026. This is the first time in the campaign that the researcher has circled back to defeat a patch built specifically to stop them.
Full patch bypass for CVE-2026-50656 ( RoguePlanet ), patched by Microsoft on July 9, 2026, in Defender engine version 1.1.26060.3008. The PoC reports 100% success on Windows 11 25H2 and Windows Server 2025, up from RoguePlanet's inconsistent reliability. The researcher states Windows 10 and its server editions are also vulnerable, but the PoC does not currently target them.
Local privilege escalation from standard user to NT AUTHORITY\SYSTEM . No kernel bug, no memory corruption, no admin rights required. Confirmed by Howler Cell on a fully patched Windows 11 Pro host.
