Cross-Site Request Forgery in the Jenkins Claim plugin

MEDIUM 4.3CVE-2021-21620 · GHSA-4ffq-6g62-j4v4 · Published 24/02/2021 · updated 17/06/2026

In short

CVE-2021-21620 is a MEDIUM (CVSS 4.3) vulnerability affecting org.jenkins-ci.plugins:claim, claim (jenkins).
Chance of exploitation in the next 30 days (EPSS): 1.6%, higher than 76.4% of all vulnerabilities.
Fix: update to 2.18.2 or later.

Package	Affected versions	Patched versions
org.jenkins-ci.plugins:claim Maven	`< 2.18.2`	`2.18.2`
claim jenkins	`≤ 2.18.1`	No fix yet

Description

Jenkins Claim Plugin 2.18.1 and earlier does not require POST requests for the form submission endpoint assigning claims, resulting in a cross-site request forgery (CSRF) vulnerability.

This vulnerability allows attackers to change claims.

Jenkins Claim Plugin 2.18.2 requires POST requests for the affected HTTP endpoint.

NVD description

A cross-site request forgery (CSRF) vulnerability in Jenkins Claim Plugin 2.18.1 and earlier allows attackers to change claims.

References

nvd.nist.gov/vuln/detail/CVE-2021-21620 · ADVISORY
jenkinsci/claim-plugin · PACKAGE
jenkins.io/security/advisory/2021-02-24 · WEB
jenkins.io/security/advisory/2021-02-24 · Vendor Advisory

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