{
  "schema_version": "1.4.0",
  "id": "GHSA-4298-89hc-6rfv",
  "modified": "2024-09-20T17:59:20Z",
  "published": "2021-08-09T20:44:32Z",
  "aliases": [
    "CVE-2021-23401"
  ],
  "summary": "Open Redirect in Flask-User",
  "details": "This affects all versions of package Flask-User. When using the `make_safe_url` function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple backslashes such as `/////evil.com/path` or `\\\\\\evil.com/path`. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using `autocorrect_location_header=False`.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
    },
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Flask-User"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.0.2.2"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23401"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-4298-89hc-6rfv"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lingthio/Flask-User"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/flask-user/PYSEC-2021-337.yaml"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2021-07-06T15:45:36Z",
    "nvd_published_at": null
  }
}