{"id":"CVE-2026-53436","aliases":["BIT-jenkins-2026-53436","GHSA-3rqh-hch3-jhpc"],"url":"https://o3.security/vulnerability/CVE-2026-53436","summary":"Jenkins Open Redirect via Relative Path Segments in Post-Login Redirect URL","details":"Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins when it contains relative path segments (`./` or `../`), allowing attackers to perform phishing attacks.","published":"2026-06-10T14:16:36.547Z","modified":"2026-08-13T18:50:48.220288216Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"},"epss":{"score":0.00282,"percentile":0.20262,"asOf":"2026-09-02"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.568"},{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.555.3"}],"fix":{"url":"https://github.com/jenkinsci/jenkins/commit/8ef52891b07eb639b38271e4bab5dab3c0f10fda","label":"jenkinsci/jenkins@8ef5289"},"references":[{"type":"ADVISORY","url":"https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3711+3755"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53436"},{"type":"WEB","url":"https://github.com/jenkinsci/jenkins/commit/8ef52891b07eb639b38271e4bab5dab3c0f10fda"},{"type":"WEB","url":"https://github.com/jenkinsci/jenkins/commit/b32f2f27a82ed187a34f55b05edcc4a83563d574"},{"type":"WEB","url":"https://github.com/jenkinsci/jenkins"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-13T18:50:48.220288216Z"}}