Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization

{
  "id": "62952e29bf9128067970cb8ec57da678349d7f4dd657cceaa22c2104f3052f99",
  "url": "https://osv.dev/vulnerability/CVE-2026-44681",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization",
    "summary": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.12 and 1.7.1, an unauthenticated open redirect in Authlib's OpenIDImplicitGrant and OpenIDHybridGrant authorization endpoint lets a remote attacker cause the authorization server to issue an HTTP 302 to an attacker-chosen URL by submitting an authorization request that omits the openid scope. This vulnerability is fixed in 1.6.12 and 1.7.1.",
    "evidence": "osv:CVE-2026-44681",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-44681",
      "aliases": [
        "CVE-2026-44681",
        "GHSA-r95x-qfjj-fjj2",
        "PYSEC-2026-188"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/authlib/authlib",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e46e515b3a87ea63ab0606b248d75f69d83a2391"
                },
                {
                  "introduced": "5d2e603ec5f10bd2c4bf20e2495c076370d65b74"
                },
                {
                  "last_affected": "5d2e603ec5f10bd2c4bf20e2495c076370d65b74"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.6.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:authlib:authlib:1.7.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.7.0"
                      },
                      {
                        "last_affected": "1.7.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.7.0",
            "v1.6.11",
            "v1.7.0",
            "v1.6.10",
            "v1.6.9",
            "v1.6.8",
            "v1.6.7",
            "v1.6.6",
            "v1.6.5",
            "v1.6.4",
            "v1.6.3",
            "v1.6.2",
            "v1.6.1",
            "v1.6.0",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.1",
            "v1.4.0",
            "v1.3.2",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v0.15",
            "v0.14.3",
            "v0.14.2",
            "v0.14.1",
            "v0.14",
            "v0.13",
            "v0.12",
            "v0.11",
            "v0.10",
            "v0.9",
            "v0.8",
            "v0.7",
            "v0.6",
            "v0.5.1",
            "v0.5",
            "v0.4.1",
            "v0.4",
            "v0.3",
            "v0.2.1",
            "v0.2",
            "v0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44681.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.683744925Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44681.json",
        "https://github.com/authlib/authlib/security/advisories/GHSA-r95x-qfjj-fjj2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44681"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-601",
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44681.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44681",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505104,
  "published_at": "2026-05-27T19:20:44.122+00:00"
}