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.

This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to submit crafted commit notifications to the `/git/notifyCommit` endpoint.

Jenkins Git Plugin 4.8.3 rejects Git SHA-1 checksum parameters that do not match the expected format. Existing values are sanitized when displayed on the UI.

This vulnerability is only exploitable in Jenkins 2.314 and earlier, LTS 2.303.1 and earlier. See the [LTS upgrade guide](https://www.jenkins.io/doc/upgrade-guide/2.303/#SECURITY-2452).

Affected Packages

Maven org.jenkins-ci.plugins:git

Affected versions: 0 (fixed in 4.8.3)

Related CVEs

CVE-2021-21684

Key Information

GHSA ID

GHSA-gghc-g8cj-4vfv

Published

May 24, 2022 7:16 PM

Last Modified

October 27, 2023 4:02 PM

CVSS Score

5.0 /10

Primary Ecosystem

Maven

Primary Package

org.jenkins-ci.plugins:git

GitHub Reviewed

✓ Yes

Dataset

Last updated: July 5, 2025 6:26 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.