CVE-2021-21646: Jenkins Templating Engine

High severity, CVSS 8.8. EPSS: 1.7% chance of exploitation in the next 30 days.

Jenkins Templating Engine Plugin 2.1 and earlier does not protect its pipeline configurations using Script Security Plugin, allowing attackers with Job/Configure permission to execute arbitrary code in the context of the Jenkins controller JVM.

Affected products

• Jenkins Templating Engine: up to and including 2.1

Published 2021-04-21. Last modified 2026-06-17.