CVE-2021-21693: Jenkins

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

When creating temporary files, agent-to-controller access to create those files is only checked after they've been created in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.

Affected products

• Jenkins Jenkins: before 2.303.3 (fixed in 2.303.3); before 2.319 (fixed in 2.319)

Published 2021-11-04. Last modified 2026-06-17.