Security advisory

{
  "id": "8e26473b756513b47c80c9fc1af2e988494f80a9fbff55d17f4082c61454660d",
  "url": "https://osv.dev/vulnerability/CVE-2020-7965",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-7965",
    "summary": "flaskparser.py in Webargs 5.x through 5.5.2 doesn't check that the Content-Type header is application/json when receiving JSON input. If the request body is valid JSON, it will accept it even if the content type is application/x-www-form-urlencoded. This allows for JSON POST requests to be made across domains, leading to CSRF.",
    "evidence": "osv:CVE-2020-7965",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-7965",
      "aliases": [
        "CVE-2020-7965",
        "GHSA-fjq3-5pxw-4wj4",
        "PYSEC-2020-156"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/marshmallow-code/webargs",
              "type": "GIT",
              "events": [
                {
                  "introduced": "cca430ebe55939a488ceda93a75bfe401228ecb5"
                },
                {
                  "last_affected": "f1ae764973b6492e3c69109060c95240b7cc3d41"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:webargs_project:webargs:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.0.0"
                      },
                      {
                        "last_affected": "5.5.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.5.2",
            "5.2.2",
            "5.5.1",
            "5.5.0",
            "5.4.0",
            "5.3.2",
            "5.3.1",
            "5.3.0",
            "5.2.0",
            "5.1.3",
            "5.1.2",
            "5.1.1.post0",
            "5.1.1",
            "5.1.0",
            "5.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7965.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:44.838296274Z",
      "provider": "osv",
      "references": [
        "https://webargs.readthedocs.io/en/latest/changelog.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-7965",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435978,
  "published_at": "2020-01-29T15:15:11.07+00:00"
}