Microsoft working on Defender patch for ShieldBreak zero-day
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Microsoft is actively working on a security patch for a newly disclosed zero-day vulnerability in Microsoft Defender named 'ShieldBreak', tracked as CVE-2026-69414. The vulnerability, disclosed by security researcher Nightmare Eclipse, allows local attackers with limited privileges to escalate to SYSTEM-level access on fully patched Windows 10, Windows 11, and Windows Server systems. The exploit acts as a bypass for the previously patched RoguePlanet vulnerability (CVE-2026-50656), indicating an incomplete fix. Microsoft has acknowledged the issue but has not yet released a patch, while the researcher has publicly released a proof-of-concept exploit due to an ongoing dispute over disclosure practices.
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