{"id":"CVE-2021-20085","aliases":["GHSA-8qpm-5c82-rf96"],"url":"https://o3.security/vulnerability/CVE-2021-20085","summary":"Prototype Pollution in backbone-query-parameters","details":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in backbone-query-parameters 0.4.0 allows a malicious user to inject properties into Object.prototype.","published":"2021-04-23T19:15:10.647Z","modified":"2026-07-08T12:05:44.583742Z","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":"backbone-query-parameters","fixedVersion":null}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/backbone-qp.md"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T12:05:44.583742Z"}}