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Vulnerability record · CVE-2021-21684 · published 6 October 2021

CVE-2021-21684: Jenkins git vulnerability

Jenkins · Git

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.

6.1 CVSS 3.1 Medium EPSS 1.2% · top 32.1% CWE-116 · CWE-116
6.1CVSS 3.1 base score, v2 4.3
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/10/06/1 Mailing ListThird Party Advisory
https://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2499 Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/10/06/1 Mailing ListThird Party Advisory
https://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2499 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2022-36882Jenkins git cross-site request forgery vulnerabilityA cross-site request forgery (CSRF) vulnerability in Jenkins Git Plugin 4.11.3 and earlier allows attackers to trigger builds of jobs configured to u…EPSS 0.72%7.5CVE-2022-36883Jenkins git missing authorization vulnerabilityA missing permission check in Jenkins Git Plugin 4.11.3 and earlier allows unauthenticated attackers to trigger builds of jobs configured to use an a…EPSS 6.9%7.5CVE-2022-30947Jenkins git vulnerabilityJenkins Git Plugin 4.11.1 and earlier allows attackers able to configure pipelines to check out some SCM repositories stored on the Jenkins controlle…EPSS 1.3%7.5CVE-2017-1000092Jenkins git cross-site request forgery vulnerabilityGit Plugin connects to a user-specified Git repository as part of form validation. An attacker with no direct access to Jenkins but able to guess at …EPSS 0.77%6.5CVE-2022-38663Jenkins git insufficiently protected credentials vulnerabilityJenkins Git Plugin 4.11.4 and earlier does not properly mask (i.e., replace with asterisks) credentials in the build log provided by the Git Username…EPSS 0.92%6.4CVE-2018-1000182Jenkins git server-side request forgery (ssrf) vulnerabilityA server-side request forgery vulnerability exists in Jenkins Git Plugin 3.9.0 and older in AssemblaWeb.java, GitBlitRepositoryBrowser.java, Gitiles.…EPSS 0.81%5.4CVE-2020-2136Jenkins git cross-site scripting vulnerabilityJenkins Git Plugin 4.2.0 and earlier does not escape the error message for the repository URL for Microsoft TFS field form validation, resulting in a…EPSS 0.85%5.3CVE-2022-36884Jenkins git missing authentication for critical function vulnerabilityThe webhook endpoint in Jenkins Git Plugin 4.11.3 and earlier provide unauthenticated attackers information about the existence of jobs configured to…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2021-21684), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.