{"id":"CVE-2026-42521","aliases":["GHSA-jp9r-mmhw-vff3"],"url":"https://o3.security/vulnerability/CVE-2026-42521","summary":"Jenkins Matrix Authorization Strategy Plugin: Unsafe deserialization allows invocation of parameterless constructors","details":"Jenkins Matrix Authorization Strategy Plugin 2.0-beta-1 through 3.2.9 (both inclusive) invokes parameterless constructors of classes specified in configuration when deserializing inheritance strategies, without restricting the classes that can be instantiated, allowing attackers with Item/Configure permission to instantiate arbitrary types, which may lead to information disclosure or other impacts depending on the classes available on the classpath.","published":"2026-04-29T14:16:19.170Z","modified":"2026-07-08T08:13:24.743228783Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},"epss":{"score":0.00246,"percentile":0.15802,"asOf":"2026-08-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jenkins-ci.plugins:matrix-auth","fixedVersion":"3.2.10"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.jenkins.io/security/advisory/2026-04-29/#SECURITY-3676"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T08:13:24.743228783Z"}}