CVE-2020-3979: Installbuilder

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

InstallBuilder for Qt Windows (versions prior to 20.7.0) installers look for plugins at a predictable location at initialization time, writable by non-admin users. While those plugins are not required, they are loaded if present, which could allow an attacker to plant a malicious library which could result in code execution with the security scope of the installer.

Affected products

• Installbuilder Installbuilder: before 20.7.0 (fixed in 20.7.0)

Published 2020-09-18. Last modified 2026-06-17.