Security advisory

{
  "id": "c00354f644bd7b999dd2d040db8e47bcf178188040c086f4c1fb96e213def775",
  "url": "https://osv.dev/vulnerability/CVE-2021-20085",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-20085",
    "summary": "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.",
    "evidence": "osv:CVE-2021-20085",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-20085",
      "aliases": [
        "CVE-2021-20085",
        "GHSA-8qpm-5c82-rf96"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jhudson8/backbone-query-parameters",
              "type": "GIT",
              "events": [
                {
                  "introduced": "dbab3a45f4699a8ac99a1e99eccf9f302d838f4e"
                },
                {
                  "last_affected": "dbab3a45f4699a8ac99a1e99eccf9f302d838f4e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:backbone-query-parameters_project:backbone-query-parameters:0.4.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.4.0"
                      },
                      {
                        "last_affected": "0.4.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.4.0",
            "v0.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20085.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:18.292037531Z",
      "provider": "osv",
      "references": [
        "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/backbone-qp.md"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-20085",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429738,
  "published_at": "2021-04-23T19:15:10.647+00:00"
}