{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0.6.1"
                  },
                  {
                    "fixed": "4.0.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "c888359f3c42bec235b2c5caab2069c9ed62457c"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v4.0.0",
                "range": [
                  {
                    "fixed": "145a9a4690cb4d9de30d15fcc2984e34c49df741"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "056e7ce13de4de913af8617891dc92e0ea43c669"
            },
            {
              "fixed": "145a9a4690cb4d9de30d15fcc2984e34c49df741"
            },
            {
              "fixed": "c888359f3c42bec235b2c5caab2069c9ed62457c"
            }
          ],
          "repo": "https://github.com/oauthlib/oauthlib",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-hj66-6f7g-4r5v"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49264.json"
  },
  "details": "OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 0.6.1 until 4.0.0, OAuthLib's RevocationEndpoint in oauthlib/oauth2/rfc6749/endpoints/revocation.py reflects an unvalidated callback request parameter into success and error response bodies when enable_jsonp=True. The callback can come from the query string or request body and is used without restricting it to a legal JavaScript function name. A browser application that loads the revocation response as trusted JSONP and permits attacker influence over callback can therefore execute attacker-controlled JavaScript in the including application's origin, with access to its DOM and script-accessible data. The feature is disabled by default, so only deployments that explicitly enable JSONP are affected. This issue is fixed in version 4.0.0.",
  "id": "CVE-2026-49264",
  "modified": "2026-10-24T02:30:44.229844430Z",
  "published": "2026-10-13T15:48:40.102Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/oauthlib/oauthlib/releases/tag/v4.0.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49264.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/oauthlib/oauthlib/security/advisories/GHSA-hj66-6f7g-4r5v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49264"
    },
    {
      "type": "FIX",
      "url": "https://github.com/oauthlib/oauthlib/commit/c888359f3c42bec235b2c5caab2069c9ed62457c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/oauthlib/oauthlib/pull/951"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OAuthLib: Unsafe JSONP callback injection in RevocationEndpoint allows arbitrary JavaScript response generation"
}