{"id":"CVE-2021-20087","aliases":["GHSA-xg68-chx2-253g"],"url":"https://o3.security/vulnerability/CVE-2021-20087","summary":"Prototype Pollution in jquery-deparam","details":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-deparam 0.5.1 allows a malicious user to inject properties into Object.prototype.","published":"2021-04-23T18:15:08.067Z","modified":"2026-07-08T21:26:37.472873Z","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":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"jquery-deparam","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/RetireJS/retire.js/blob/6da45fcb6a3425e55ee8181b2ac35168879bf086/repository/jsrepository-master.json#L824-L842"},{"type":"EVIDENCE","url":"https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-deparam.md"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T21:26:37.472873Z"}}