{"cve":"CVE-2021-21608","nvd":{"published":"2021-01-13T16:15:13.837","modified":"2026-06-17T03:35:51.950","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4},"cwes":["CWE-79"],"references":["https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2035","https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2035"],"products":["jenkins:jenkins"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2021-21608","score":0.01041,"percentile":0.64046,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-wv63-gwr9-5c55","url":"https://osv.dev/vulnerability/GHSA-wv63-gwr9-5c55","summary":"Stored XSS vulnerability in Jenkins button labels","modified":"2024-02-16T08:13:06.078623Z","packages":[{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","ranges":["<2.275"],"fixed":["2.275"]},{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","ranges":[">=2.263.2 <2.275"],"fixed":["2.275"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}