{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:authlib:authlib:1.7.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.6.10"
              },
              {
                "introduced": "1.7.0"
              },
              {
                "last_affected": "1.7.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ef09aebbba4439dedb22bd15777d1b3458b6f0ab"
            },
            {
              "introduced": "5d2e603ec5f10bd2c4bf20e2495c076370d65b74"
            },
            {
              "fixed": "3be08468201a7766a93012ce149ea12822cab096"
            }
          ],
          "repo": "https://github.com/authlib/authlib",
          "type": "GIT"
        }
      ],
      "versions": [
        "1.7.0",
        "= 1.7.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-w8p2-r796-3vmq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41479.json"
  },
  "details": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.",
  "id": "CVE-2026-41479",
  "modified": "2026-07-08T05:36:11.692088870Z",
  "published": "2026-06-22T20:35:13.699Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41479.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-w8p2-r796-3vmq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41479"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab096"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Authlib OAuth 2.0 authorization endpoint open redirects to attacker-controlled redirect_uri on unsupported response_type"
}