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GHSA-gghc-g8cj-4vfv

Stored XSS vulnerability in Jenkins Git Plugin

Source: GitHub Advisory Database (reviewed) Moderate CVE-2021-21684

Packages

EcosystemPackageAffectedFixed in
Maven org.jenkins-ci.plugins:git < 4.8.3 4.8.3

Details

As written in the advisory (Markdown source, shown as plain text).

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).

References

External links from the advisory. They lead to third-party sites.