Cross-site scripting in Jenkins Kiuwan Plugin
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.
Only older releases of Jenkins are affected by this vulnerability. Jenkins 2.275 and newer, LTS 2.263.2 and newer include a protection preventing this from being exploitable.
Jenkins Kiuwan Plugin 1.6.1 escapes affected parts of the error message in the form validation endpoint.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.jenkins-ci.plugins:kiuwanJenkinsPlugin | < 1.6.1 | 1.6.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-21666
- https://github.com/jenkinsci/kiuwan-plugin/commit/a5f6fdb1b8ad09d170547a4cc2b90c4829ef1f0a
- https://github.com/jenkinsci/kiuwan-plugin
- https://www.jenkins.io/security/advisory/2021-06-10/#SECURITY-2367
- http://www.openwall.com/lists/oss-security/2021/06/10/14
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Java / Kotlin (Maven)
- Package
org.jenkins-ci.plugins:kiuwanJenkinsPlugin- Disclosed
- 16.06.2021
- Updated
- 11.10.2026 11:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8h77-3xwr-hqhh - CC BY 4.0
Vulnerability history: org.jenkins-ci.plugins:kiuwanJenkinsPlugin
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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