🛡️ **SHIELDCRASH / SHIELDBREAK: Microsoft Defender Zero-Day Privilege Escalation — Active Exploitation Confirmed**
Published Thursday, September 10, 2026 at 05:04 AM PT BLUF: Microsoft Defender contains a critical zero-day vulnerability (ShieldCrash/ShieldBreak) enabling local privilege escalation to SYSTEM. Multiple variants confirmed across Windows deployments. Patch in development; at least one variant already has public bypass PoC. Affected systems should assume compromise possible if Defender has processed untrusted input. DETAILS: Vulnerability chain: Zero-day in Microsoft Defender processes enable unauthenticated local privilege escalation to SYSTEM context; exploitation requires code execution as standard user first, then leverages Defender internals to gain full system privileges. ...