After Microsoft threatened legal action, a security researcher publishes a new Windows zero-day bug

This is the latest zero-day released by security researcher Nightmare Eclipse, despite Microsoft publicly threatening to take legal action against them.

Researcher creates workaround for Microsoft Defender security patch

The PoC posted by Nightmare Eclipse, who has been feuding with Microsoft for months, grants an attacker system-level privileges once they gain any access.

Xbox Says July’s Massive Outage Was Made Far Worse By A Bug That’s Now Been Fixed

An underlying service required for XBOX Home Console sharing and Game Pass purchased content, as well as some PC scenarios, experienced an outage whereby an update to the system put some services in ...

New Microsoft Defender 'ShieldBreak' zero-day grants SYSTEM privileges

Nightmare Eclipse has released a new Microsoft Defender zero-day exploit named "ShieldBreak" after Microsoft released the August 2026 Patch Tuesday security updates.
PCMag

Disgruntled Researcher Discloses New Zero-Day in Windows Antivirus

The 'ShieldBreak' flaw can let an attacker use Windows Defender to escalate their privileges on the OS. Microsoft previously threatened legal action against the researcher, Nightmare Eclipse.