{"id":"CVE-2021-20085","aliases":["EUVD-2021-1019","GHSA-8qpm-5c82-rf96"],"status":"published","title":"Prototype Pollution in backbone-query-parameters","description":"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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01606,"percentile":0.76088,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1321"],"published":"2021-04-23T18:41:07Z","modified":"2026-10-24T10:30:18Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"backbone-query-parameters","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.4.0"}]}]},{"source":"osv","ecosystem":"npm","package":"backbone-query-parameters","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.4.0"}]}]}],"products":[{"vendor":"backbone-query-parameters_project","product":"backbone-query-parameters"}],"references":[{"url":"https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/backbone-qp.md","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20085","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-8qpm-5c82-rf96"}],"sources":{"cve":[{"id":"CVE-2021-20085","description":"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.","status":"published","published":"2021-04-23T18:41:07Z","modified":"2024-08-03T17:30:07.445Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-1019","description":"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.","status":"published","published":"2021-04-23T18:41:07Z","modified":"2024-08-03T17:30:07Z","updated_at":"2026-11-03T03:25:10.418596Z"}],"ghsa":[{"id":"GHSA-8qpm-5c82-rf96","title":"Prototype Pollution in backbone-query-parameters","description":"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.","status":"published","published":"2021-05-06T15:52:02Z","modified":"2023-08-08T19:54:28Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:36:59.456342Z"}],"nvd":[{"id":"CVE-2021-20085","description":"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.","status":"published","published":"2021-04-23T19:15:10.647Z","modified":"2026-06-17T03:33:15Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:06:52.03307Z"}],"osv":[{"id":"CVE-2021-20085","description":"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.","status":"published","published":"2021-04-23T19:15:10.647Z","modified":"2026-10-24T10:30:18.292037531Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:17.663289Z"},{"id":"GHSA-8qpm-5c82-rf96","title":"Prototype Pollution in backbone-query-parameters","description":"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.","status":"published","published":"2021-05-06T15:52:02Z","modified":"2023-11-08T04:04:34.528311Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:42.78452Z"}]}}