{"id":"CVE-2021-21670","aliases":["BIT-jenkins-2021-21670","GHSA-q4wp-8c99-69pw"],"url":"https://o3.security/vulnerability/CVE-2021-21670","summary":"Improper permission checks allow canceling queue items and aborting builds in Jenkins","details":"Jenkins 2.299 and earlier, LTS 2.289.1 and earlier allows users to cancel queue items and abort builds of jobs for which they have Item/Cancel permission even when they do not have Item/Read permission.\n\nJenkins 2.300, LTS 2.289.2 requires that users have Item/Read permission for applicable types in addition to Item/Cancel permission.\n\nAs a workaround on earlier versions of Jenkins, do not grant Item/Cancel permission to users who do not have Item/Read permission.","published":"2021-06-30T17:15:08.900Z","modified":"2026-07-09T00:12:29.083126Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},"epss":{"score":0.01982,"percentile":0.78799,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.289.2"},{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.300"}],"fix":{"url":"https://github.com/jenkinsci/jenkins/commit/86b7d7e789586575522650c60d591605facb1d70","label":"jenkinsci/jenkins@86b7d7e"},"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/06/30/1"},{"type":"ADVISORY","url":"https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2278"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21670"},{"type":"WEB","url":"https://github.com/jenkinsci/jenkins/commit/86b7d7e789586575522650c60d591605facb1d70"},{"type":"PACKAGE","url":"https://github.com/jenkinsci/jenkins"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T00:12:29.083126Z"}}