{"id":"CVE-2026-49264","summary":"OAuthLib: Unsafe JSONP callback injection in RevocationEndpoint allows arbitrary JavaScript response generation","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.","aliases":["GHSA-hj66-6f7g-4r5v","PYSEC-2026-4113"],"modified":"2026-10-24T02:30:44.229844430Z","published":"2026-10-13T15:48:40.102Z","related":["SUSE-SU-2026:24139-1","SUSE-SU-2026:24189-1","SUSE-SU-2026:24246-1","SUSE-SU-2026:4807-1","SUSE-SU-2026:4810-1","openSUSE-SU-2026:11973-1","openSUSE-SU-2026:22103-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49264.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-79"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/oauthlib/oauthlib","events":[{"introduced":"056e7ce13de4de913af8617891dc92e0ea43c669"},{"fixed":"145a9a4690cb4d9de30d15fcc2984e34c49df741"},{"fixed":"c888359f3c42bec235b2c5caab2069c9ed62457c"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0.6.1"},{"fixed":"4.0.0"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"c888359f3c42bec235b2c5caab2069c9ed62457c"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"145a9a4690cb4d9de30d15fcc2984e34c49df741"}],"source":"REFERENCES_TAG","original_tag":"v4.0.0"}]}}],"versions":["v3.3.0","v3.1.0","v3.0.1","v2.0.5","v3.0.0","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v1.1.2","1.1.1","1.0.1","1.1.0","1.0.3","1.0.2","1.0.0","0.7.2","0.7.1","0.7.0","0.6.3","0.6.2","0.6.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49264.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}