CVE-2021-21666
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-21666- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-21666- Updated
- 2026-11-02
EUVDEUVD-2021-1292 No score
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.
- Record
EUVD-2021-1292- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8h77-3xwr-hqhh
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.
- Record
GHSA-8h77-3xwr-hqhh- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-8h77-3xwr-hqhh
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.
- Record
GHSA-8h77-3xwr-hqhh- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.jenkins-ci.plugins:kiuwanJenkinsPluginMaven |
before 1.6.1 | 1.6.1 |
org.jenkins-ci.plugins:kiuwanJenkinsPluginMaven |
before 1.6.1, plus listed versions 1.01.11.21.3.21.3.3 Show 12 moreShow less1.3.41.3.51.4.01.4.11.4.21.4.31.4.41.4.61.5.01.5.11.5.21.6.0 |
1.6.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-21666 is a medium vulnerability (CVSS 6.1) in Jenkins Kiuwan, published June 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.22%, the 68th percentile. Fixed in org.jenkins-ci.plugins:kiuwanJenkinsPlugin 1.6.1.