CVE-2021-21666: Jenkins Kiuwan

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

Jenkins Kiuwan Plugin 1.6.0 and earlier does not escape query parameters in an error message for a form validation endpoint, resulting in a reflected cross-site scripting (XSS) vulnerability.

Affected products

• Jenkins Kiuwan: up to and including 1.6.0

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