CVE-2025-43715 Information

Description

Nullsoft Scriptable Install System (NSIS) before 3.11 on Windows allows local users to escalate privileges to SYSTEM during an installation because the temporary plugins directory is created under %WINDIR%\temp and unprivileged users can place a crafted executable file by winning a race condition. This occurs because EW_CREATEDIR does not always set the CreateRestrictedDirectory error flag.

Reference

https://nsis.sourceforge.io/Docs/AppendixF.html#v3.11-rl https://sourceforge.net/p/nsis/bugs/1315/