CVE-2021-21684

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-06 · updated 2026-06-17
Weakness: CWE-116

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.

Affected products

Jenkins project Jenkins Git Plugin: through 4.8.2

References

http://www.openwall.com/lists/oss-security/2021/10/06/1
https://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2499
http://www.openwall.com/lists/oss-security/2021/10/06/1
https://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2499

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