Researcher, PurpleHound offensive content team
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Last updated Nov 14, 2026
Tested the exploit
On November 10, a researcher publishing as Nightmare Eclipse released SignDrop, a working exploit that lets an ordinary Windows user gain full System rights. The flaw lives in the Common Log File System (CLFS), a logging service built into Windows. It abuses a security check Microsoft added to that driver in October 2025.
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