vulnerability
Nightmare Eclipse Drops Windows Zero-Day Exploit ‘ShieldBreak’
High
Summary
A disgruntled security researcher, Nightmare Eclipse, released a new zero-day exploit called ShieldBreak targeting Microsoft Defender, allowing users to escalate privileges on Windows 11 and Server 2025. This exploit leverages a race condition within Defender’s cloud-hydration scan process, and follows a pattern of zero-day releases by the researcher.
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