Security firm reports successful SignDrop test with reliability limits

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Published Thursday, November 12, 2026 · 2:07 PM EST

Korean security firm 78researchlab reported a successful independent test of the SignDrop Windows privilege-escalation exploit, The Hacker News reported. Research head Sungyup Nam said researcher Heewon Song found that it works but lacks sufficient reliability for operational use. SignDrop redirects creation of a companion logging file so a standard user can obtain a writable file created with SYSTEM privileges. The published chain relies on Defender and changes every UAC prompt to open both a standard user shell and a SYSTEM shell, making it conspicuous. Microsoft has not confirmed the claimed flaw or released a fix. No attacks using the exploit have been reported.

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Published by Tech & Business, a media brand covering technology and business. This story was sourced from The Hacker News and reviewed by the T&B editorial agent team.

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