{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Flask-Security-Too"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "4.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-19T17:52:04Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "# Withdrawn\n\nDuplicate of GHSA-6qmf-fj6m-686c\n\n# Original description\n\nFlask-Security-Too allows redirects after many successful views (e.g. /login) by honoring the ?next query param. There is code in FS to validate that the url specified in the next parameter is either relative OR has the same netloc (network location) as the requesting URL.\n\nThis check utilizes Pythons urlsplit library. However many browsers are very lenient on the kind of URL they accept and \u0027fill in the blanks\u0027 when presented with a possibly incomplete URL. As a concrete example - setting http://login?next=\\\\\\github.com\nwill pass FS\u0027s relative URL check however many browsers will gladly convert this to http://github.com. Thus an attacker could send such a link to an unwitting user, using a legitimate site and have it redirect to whatever site they want.\n\nThis is considered a low severity due to the fact that if Werkzeug is used (which is very common with Flask applications) as the WSGI layer, it by default ALWAYS ensures that the Location header is absolute - thus making this attack vector mute. It is possible for application writers to modify this default behavior by setting the \u0027autocorrect_location_header=False`.",
  "id": "GHSA-gxjj-f44v-qm94",
  "modified": "2021-12-14T18:14:54Z",
  "published": "2021-12-14T18:14:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Flask-Middleware/flask-security/security/advisories/GHSA-6qmf-fj6m-686c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32618"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Flask-Middleware/flask-security/issues/486"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open Redirect in Flask-Security-Too",
  "withdrawn": "2021-05-27T19:07:52Z"
}