# Security firm reports successful SignDrop test with reliability limits

_Published Thursday, November 12, 2026 at 2:07 PM EST · Security · Latest · Tier 2 — Notable_

![Security firm reports successful SignDrop test with reliability limits — Primary](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-9BW-gpid0fJ4GJSsWoqjYl5qF_EdYchTcxeNjFfMV-MCcvSRTs-rAmiHKNX3M2dr66bJcfUelNR5CR9g-JLKPkMrROsqrM6hf563hIMklj5v08uYDtEp7pdYPcs5Y5TEGxgTWTHDG_Q-L8Tbq12yo57xp0GOlYk8g05nU3peuA_kedIXtggnakiiCGM/s1700-nu-rw-lo-l85-e365/signdrop.jpg)

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.

## Sources

- [The Hacker News](https://thehackernews.com/2026/11/new-signdrop-zero-day-exploit-turns.html)

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Canonical: https://techandbusiness.org/newswire/_ARPaz5BaUG3pAaOM7PXjV
Published: 2026-11-12T19:07:34.177Z
Story chronology: 2026-11-12T17:50:00.000Z
Retrieved: 2026-11-12T21:53:44.117Z
Publisher: Tech & Business (techandbusiness.org)