CVE-2021-21608

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-01-13 · updated 2026-06-17
Weakness: CWE-79

Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape button labels in the Jenkins UI, resulting in a cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to control button labels.

Affected products

Jenkins: through 2.263.1; through 2.274

References

https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2035
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2035

Get alerted when CVE-2021-21608 or the next vulnerability affects your stack