{"id":"CVE-2021-21673","aliases":["EUVD-2022-2055","GHSA-2vvr-5757-qp87"],"status":"published","title":"Open redirect vulnerability in Jenkins CAS Plugin","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01584,"percentile":0.75784,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2021-06-30T16:45:20Z","modified":"2026-10-24T10:30:27Z","fixes":[{"ecosystem":"Maven","package":"org.jenkins-ci.plugins:cas-plugin","fixed_in":["1.6.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.jenkins-ci.plugins:cas-plugin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.6.0"},{"fixed":"1.6.1"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.jenkins-ci.plugins:cas-plugin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1"}]}],"versions":["1.0.0","1.1.0","1.1.1","1.1.2","1.2.0","1.3.0","1.4.0","1.4.1","1.4.2","1.4.3","1.5.0","1.6.0"]}],"products":[{"vendor":"jenkins","product":"cas"},{"vendor":"jenkins project","product":"jenkins cas plugin"}],"references":[{"url":"https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"http://www.openwall.com/lists/oss-security/2021/06/30/1","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21673","tags":["advisory"]},{"url":"https://github.com/jenkinsci/cas-plugin/commit/8ac536a953156160dbabb61bdb3b9bc75c3d0ef9","tags":["web"]},{"url":"https://github.com/advisories/GHSA-2vvr-5757-qp87"},{"url":"https://github.com/jenkinsci/cas-plugin","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-21673","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.","status":"published","published":"2021-06-30T16:45:20Z","modified":"2024-08-03T18:23:29.2Z","updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2022-2055","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.","status":"published","published":"2021-06-30T16:45:20Z","modified":"2024-08-03T18:23:29Z","updated_at":"2026-11-03T03:25:04.672228Z"}],"ghsa":[{"id":"GHSA-2vvr-5757-qp87","title":"Open redirect vulnerability in Jenkins CAS Plugin","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins.\n\nThis allows attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site after successful authentication.\n\nJenkins CAS Plugin 1.6.1 only redirects to relative (Jenkins) URLs.","status":"published","published":"2022-05-24T19:06:35Z","modified":"2023-12-19T14:56:38Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:37:26.727664Z"}],"nvd":[{"id":"CVE-2021-21673","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.","status":"published","published":"2021-06-30T17:15:09.16Z","modified":"2026-06-17T03:35:58.46Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:55.259633Z"}],"osv":[{"id":"CVE-2021-21673","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.","status":"published","published":"2021-06-30T17:15:09.16Z","modified":"2026-10-24T10:30:27.59738967Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.367807Z"},{"id":"GHSA-2vvr-5757-qp87","title":"Open redirect vulnerability in Jenkins CAS Plugin","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins.\n\nThis allows attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site after successful authentication.\n\nJenkins CAS Plugin 1.6.1 only redirects to relative (Jenkins) URLs.","status":"published","published":"2022-05-24T19:06:35Z","modified":"2024-02-16T08:13:13.036992Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:34.700741Z"}]}}