ShieldCrash PoC: Microsoft Defender Fix Bypass

Nightmare Eclipse published a public PoC named ShieldCrash that reportedly bypasses Microsoft’s fix for CVE-2026-69414 (ShieldBreak), enabling arbitrary SYSTEM-level file reads on updated Windows systems; the issue is presented as a local privilege-escalation path requiring an existing low-privilege foothold, with no confirmed in-the-wild exploitation or Microsoft confirmation.