Will Microsoft Defender 'ShieldCrash' zero-day be actively exploited before a patch is released?

Researcher 'Nightmare Eclipse' released a new zero-day exploit in Microsoft Defender named 'ShieldCrash' that grants SYSTEM-level access, disclosed after Microsoft's September 2026 Patch Tuesday. Source: Bleeping Computer.

Resolution Criteria

PUBLIC EVIDENCE of active exploitation in the wild: verified PoC code execution, security vendor reports, malware samples leveraging ShieldCrash, or credible incident reports. Microsoft security advisory confirming exploitation or patch release ends the market (NO if patched before exploitation confirmed).