CVE-2021-21639: Jenkins

Medium severity, CVSS 4.3. EPSS: 2.7% chance of exploitation in the next 30 days.

Jenkins 2.286 and earlier, LTS 2.277.1 and earlier does not validate the type of object created after loading the data submitted to the `config.xml` REST API endpoint of a node, allowing attackers with Computer/Configure permission to replace a node with one of a different type.

Affected products

• Jenkins Jenkins: up to and including 2.277.1; up to and including 2.286

Published 2021-04-07. Last modified 2026-06-17.