CVE-2025-43715: Nullsoft Scriptable Install System

High severity, CVSS 8.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Nullsoft Nullsoft Scriptable Install System: before 3.11 (fixed in 3.11)

Published 2025-04-17. Last modified 2026-06-17.