Cybersecurity · 3 views
New Windows SignDrop zero-day gives hackers SYSTEM privileges
Security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) has released a new Windows zero-day exploit that can let attackers gain SYSTEM privileges.
Summary
Security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) has released a new Windows zero-day exploit that can let attackers gain SYSTEM privileges. Named SignDrop , it exploits mitigations Microsoft introduced in October 2025 to defend against authentication attacks targeting vulnerabilities in the Common Log File System (CLFS) driver. Naceri added that attacks exploiting CLFS vulnerabilities dropped sharply after the mitigation, but that Microsoft's mitigation itself introduced this new vulnerability.
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