Security advisory

{
  "id": "bce443ea261ad56693dbfdef1d64c12d9aad1330570b189bd6b4bca027e7a5d5",
  "url": "https://osv.dev/vulnerability/CVE-2020-28724",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-28724",
    "summary": "Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.",
    "evidence": "osv:CVE-2020-28724",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-28724",
      "aliases": [
        "CVE-2020-28724",
        "GHSA-3p3h-qghp-hvh2",
        "PYSEC-2020-157"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pallets/werkzeug",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e6d0e510738952788fdd01bbfe5dfb2d8cff0ba4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:palletsprojects:werkzeug:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.11.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.11.5",
            "0.11.4",
            "0.11.3",
            "0.11.2",
            "0.11.1",
            "0.11",
            "0.10",
            "0.9",
            "0.8",
            "0.7",
            "0.6.2",
            "0.6.1",
            "0.6",
            "0.4.1",
            "0.4",
            "0.3",
            "0.2",
            "0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-28724.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:08.544632617Z",
      "provider": "osv",
      "references": [
        "https://github.com/pallets/flask/issues/1639",
        "https://github.com/pallets/werkzeug/issues/822",
        "https://github.com/pallets/werkzeug/pull/890/files"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-28724",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384202,
  "published_at": "2020-11-18T15:15:12.99+00:00"
}