{"id":"CVE-2026-116672","summary":"Authlib RFC 7592 examples omit registration-access-token client binding","details":"Authlib is a Python library which builds OAuth and OpenID Connect servers. From 0.15 until 1.9.1, the documented ClientConfigurationEndpoint.authenticate_client and ClientConfigurationEndpoint.check_permission reference implementations look up a target client from request-controlled client_id data and check only whether that target is editable, without verifying that request.credential belongs to the target client. Deployments following both examples can allow a client holding any valid registration access token to read, modify, or delete another client's registration. Changing redirect_uris can enable authorization code or token interception, while deleting registrations can deny service to affected clients. This issue is fixed in version 1.9.1.","aliases":["GHSA-c73q-w75p-j82v"],"modified":"2026-11-03T17:27:20.600865473Z","published":"2026-10-27T16:31:48.429Z","related":["openSUSE-SU-2026:12390-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-1188","CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116672.json"},"references":[{"type":"WEB","url":"https://github.com/authlib/authlib/releases/tag/v1.9.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116672.json"},{"type":"ADVISORY","url":"https://github.com/authlib/authlib/security/advisories/GHSA-c73q-w75p-j82v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116672"},{"type":"FIX","url":"https://github.com/authlib/authlib/commit/1bd2a313492ce0a4d0571c150730907aa3fc91ff"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/authlib/authlib","events":[{"introduced":"4e501ce3e58e2daaaba0b82018b047bb61741f0c"},{"fixed":"46b94870d915ee77430da8fa2a358378d90b3a45"},{"fixed":"1bd2a313492ce0a4d0571c150730907aa3fc91ff"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"0.15"},{"fixed":"1.9.1"}],"source":"AFFECTED_FIELD"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"1bd2a313492ce0a4d0571c150730907aa3fc91ff"}]},{"original_tag":"v1.9.1","range":[{"fixed":"46b94870d915ee77430da8fa2a358378d90b3a45"}],"source":"REFERENCES_TAG"}]}}],"versions":["v1.9.0","v1.8.0","v1.7.2","v1.7.1","1.7.1","v1.7.0","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"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-116672.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}