ghsa-8vgw-p6qm-5gr7
Vulnerability from github
Published
2025-03-20 12:32
Modified
2025-03-21 22:10
Severity ?
5.3 (Medium) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Summary
Flask-CORS allows for inconsistent CORS matching
Details

A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquote_plus function, which converts the '+' character to a space ' '. This behavior leads to incorrect path normalization, causing potential mismatches in CORS configuration. As a result, endpoints may not be matched correctly to their CORS settings, leading to unexpected CORS policy application. This can cause unauthorized cross-origin access or block valid requests, creating security vulnerabilities and usability issues.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "flask-cors"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "4.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-6844"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-21T22:10:24Z",
    "nvd_published_at": "2025-03-20T10:15:34Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the \u0027+\u0027 character in URL paths. The request.path is passed through the unquote_plus function, which converts the \u0027+\u0027 character to a space \u0027 \u0027. This behavior leads to incorrect path normalization, causing potential mismatches in CORS configuration. As a result, endpoints may not be matched correctly to their CORS settings, leading to unexpected CORS policy application. This can cause unauthorized cross-origin access or block valid requests, creating security vulnerabilities and usability issues.",
  "id": "GHSA-8vgw-p6qm-5gr7",
  "modified": "2025-03-21T22:10:24Z",
  "published": "2025-03-20T12:32:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-6844"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/corydolphin/flask-cors"
    },
    {
      "type": "WEB",
      "url": "https://github.com/corydolphin/flask-cors/blob/main/flask_cors/extension.py#L193"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Flask-CORS allows for inconsistent CORS matching"
}


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