Microsoft Patches ShieldBreak Zero-Day in Defender
TL;DR. Microsoft is preparing a security patch for a newly disclosed zero-day vulnerability in Defender, tracked as CVE-2026-69414. - The ShieldBreak flaw allows local privilege escalation, bypassing a previous fix for the RoguePlanet vulnerability. - Attackers with limited permissions can gain SYSTEM privileges on fully patched Windows 10, Windows 11, and Windows Server systems. - The security researcher 'Nightmare Eclipse' disclosed the vulnerability, sharing a proof-of-concept exploit.
- Microsoft is developing a security patch for the ShieldBreak zero-day vulnerability in Defender.
- The flaw, CVE-2026-69414, allows local privilege escalation on Windows 10, 11, and Server.
- ShieldBreak bypasses a prior patch for the RoguePlanet vulnerability.
- A proof-of-concept exploit demonstrates the flaw's effectiveness for attackers with limited permissions.
Sources
- Microsoft working on Defender patch for ShieldBreak zero-day — bleepingcomputer.com