{"cve":"CVE-2021-20083","nvd":{"published":"2021-04-23T19:15:09.163","modified":"2026-06-17T03:33:14.783","status":"Modified","description":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-plugin-query-object 2.2.3 allows a malicious user to inject properties into Object.prototype.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-1321"],"references":["http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html","https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7CR6VGITIB2TXXZ6B5QRRWPU5S4BXQPD/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJX6NVXSRN3RX3YUVEJQ4WUTQSDL3DSR/","http://packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html"],"products":["jquery-plugin-query-object_project:jquery-plugin-query-object"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-20083","score":0.04186,"percentile":0.9093,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q9xg-h756-8689","url":"https://osv.dev/vulnerability/GHSA-q9xg-h756-8689","summary":"jquery-plugin-query-object contains prototype pollution vulnerability","modified":"2023-11-08T04:04:34.468331Z","packages":[{"ecosystem":"npm","name":"jquery-query-object","purl":"pkg:npm/jquery-query-object","ranges":["<=2.2.3"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}