{"id":"CVE-2021-21657","aliases":["GHSA-cphv-7cxw-5hcc"],"url":"https://o3.security/vulnerability/CVE-2021-21657","summary":"XXE vulnerability in Jenkins Filesystem Trigger Plugin","details":"Jenkins Filesystem Trigger Plugin 0.40 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.\n\nThis allows attackers with Job/Configure permission or otherwise able to control the contents of an XML file being polled for changes to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the polling Jenkins controller or agent, server-side request forgery, or denial-of-service attacks.\n\nJenkins Filesystem Trigger Plugin 0.41 disables external entity resolution for its XML parser.","published":"2021-05-25T17:15:08.037Z","modified":"2026-07-09T06:35:00.271448Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.01596,"percentile":0.73448,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jenkins-ci.plugins:fstrigger","fixedVersion":"0.41"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/25/3"},{"type":"ADVISORY","url":"https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2339"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21657"},{"type":"PACKAGE","url":"https://github.com/jenkinsci/fstrigger-plugin"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T06:35:00.271448Z"}}