ShieldBreak - Geek Feed

Microsoft working on Defender patch for ShieldBreak zero-day

August 18, 2026August 18, 2026 geekfeed0Tagged 0day, Elevation of Privileges, Local Privilege Escalation, microsoft, Microsoft Defender, Nightmare Eclipse, Privilege Escalation, ShieldBreak, windows, Zero-Day

On Friday, Microsoft confirmed it has begun working on a security patch for a Defender zero-day vulnerability named “ShieldBreak.” A security researcher who uses the “Nightmare Eclipse” handle disclosed this privilege escalation vulnerability after Microsoft released the August 2026 Patch Tuesday security updates. ”Microsoft is aware of the reported vulnerability and is actively investigating the […]

3 mins read

New Microsoft Defender ‘ShieldBreak’ zero-day grants SYSTEM privileges

August 14, 2026August 14, 2026 geekfeed0Tagged 0day, Elevation of Privileges, Local Privilege Escalation, microsoft, Microsoft Defender, Nightmare Eclipse, Privilege Escalation, ShieldBreak, Zero-Day

A security researcher known as Nightmare Eclipse has released a new Microsoft Defender zero-day exploit named “ShieldBreak” after Microsoft released the August 2026 Patch Tuesday security updates. The new vulnerability is described as a bypass for RoguePlanet, another Defender privilege escalation flaw disclosed in June and patched by Microsoft one month later. However, cybersecurity expert Kevin […]

2 mins read