ShieldBreak bypasses Microsoft’s patch for earlier Defender flaw

ShieldBreak (CVE-2026-69414) is a disclosed local elevation-of-privilege vulnerability in Microsoft Defender's Malware Protection Engine that bypasses an earlier RoguePlanet patch via a different exploitation method; proof-of-concept code exists, no official fix is yet available, and Microsoft is working on updates. The exploit reportedly requires Defender to be enabled, so disabling Defender prevents this specific chain but is not recommended as a general mitigation; users are advised to apply updates when released, avoid running untrusted code, maintain backups, and use up-to-date anti-malware protections.