GHSA-HP6R-R9VC-Q8WX

Vulnerability from github – Published: 2025-12-19 06:30 – Updated: 2025-12-19 21:08
VLAI?
Summary
FastAPI SSP is vulnerable to Cross-site Request Forgery (CSRF) through improper OAuth parameter validation
Details

Versions of the package fastapi-sso before 0.19.0 are vulnerable to Cross-site Request Forgery (CSRF) due to the improper validation of the OAuth state parameter during the authentication callback. While the get_login_url method allows for state generation, it does not persist the state or bind it to the user's session. Consequently, the verify_and_process method accepts the state received in the query parameters without verifying it against a trusted local value. This allows a remote attacker to trick a victim into visiting a malicious callback URL, which can result in the attacker's account being linked to the victim's internal account.

Severity ?
6.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
5.4 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "fastapi-sso"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.19.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-14546"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-19T21:08:32Z",
    "nvd_published_at": "2025-12-19T05:16:09Z",
    "severity": "MODERATE"
  },
  "details": "Versions of the package fastapi-sso before 0.19.0 are vulnerable to Cross-site Request Forgery (CSRF) due to the improper validation of the OAuth state parameter during the authentication callback. While the get_login_url method allows for state generation, it does not persist the state or bind it to the user\u0027s session. Consequently, the verify_and_process method accepts the state received in the query parameters without verifying it against a trusted local value. This allows a remote attacker to trick a victim into visiting a malicious callback URL, which can result in the attacker\u0027s account being linked to the victim\u0027s internal account.",
  "id": "GHSA-hp6r-r9vc-q8wx",
  "modified": "2025-12-19T21:08:32Z",
  "published": "2025-12-19T06:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-14546"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tomasvotava/fastapi-sso/issues/266"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tomasvotava/fastapi-sso/commit/6117d1a5ad498ba57d671e8a059ebe20db5abe02"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tomasvotava/fastapi-sso"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-PYTHON-FASTAPISSO-14386403"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "FastAPI SSP is vulnerable to Cross-site Request Forgery (CSRF) through improper OAuth parameter validation"
}


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