CVE-2021-21684: Jenkins Git

Medium severity, CVSS 6.1. EPSS: 1.2% chance of exploitation in the next 30 days.

Jenkins Git Plugin 4.8.2 and earlier does not escape the Git SHA-1 checksum parameters provided to commit notifications when displaying them in a build cause, resulting in a stored cross-site scripting (XSS) vulnerability.

Affected products

• Jenkins Git: up to and including 4.8.2

Published 2021-10-06. Last modified 2026-06-17.