{"id":"CVE-2026-41479","summary":"Authlib OAuth 2.0 authorization endpoint open redirects to attacker-controlled redirect_uri on unsupported response_type","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.","aliases":["GHSA-w8p2-r796-3vmq"],"modified":"2026-07-08T08:13:13.035578265Z","published":"2026-06-22T20:35:13.699Z","database_specific":{"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41479.json","cwe_ids":["CWE-601"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/authlib/authlib","events":[{"introduced":"0"},{"fixed":"ef09aebbba4439dedb22bd15777d1b3458b6f0ab"},{"introduced":"5d2e603ec5f10bd2c4bf20e2495c076370d65b74"},{"fixed":"3be08468201a7766a93012ce149ea12822cab096"}],"database_specific":{"cpe":["cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*","cpe:2.3:a:authlib:authlib:1.7.0:*:*:*:*:*:*:*"],"source":["CPE_RANGE","CPE_STRING","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"1.6.10"},{"introduced":"1.7.0"},{"last_affected":"1.7.0"}]}}],"versions":["1.7.0","= 1.7.0","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-2026-41479.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"}]}