{"id":"CVE-2021-21603","aliases":["BIT-jenkins-2021-21603","GHSA-98gq-6hxg-52r6"],"url":"https://o3.security/vulnerability/CVE-2021-21603","summary":"XSS vulnerability in Jenkins notification bar","details":"Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape notification bar response contents (typically shown after form submissions via Apply button).\n\nThis results in a cross-site scripting (XSS) vulnerability exploitable by attackers able to influence notification bar contents.\n\nJenkins 2.275, LTS 2.263.2 escapes the content shown in notification bars.","published":"2021-01-13T16:15:13.460Z","modified":"2026-07-09T00:12:30.583584Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.275"},{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.275"}],"fix":{"url":"https://github.com/jenkinsci/jenkins/commit/f5d98421604e44f398e7de9d222b191a705608af","label":"jenkinsci/jenkins@f5d9842"},"references":[{"type":"ADVISORY","url":"https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-1889"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21603"},{"type":"WEB","url":"https://github.com/jenkinsci/jenkins/commit/f5d98421604e44f398e7de9d222b191a705608af"},{"type":"PACKAGE","url":"https://github.com/jenkinsci/jenkins"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T00:12:30.583584Z"}}