{"cve":"CVE-2026-41479","nvd":{"published":"2026-06-22T21:16:24.017","modified":"2026-06-26T20:10:38.003","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","score":5.4},"cwes":["CWE-601"],"references":["https://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab096","https://github.com/authlib/authlib/security/advisories/GHSA-w8p2-r796-3vmq"],"products":["authlib:authlib"],"source":"nvd","synced_at":"2026-10-19T22:39:28.638635428+00:00"},"epss":{"cve":"CVE-2026-41479","score":0.00257,"percentile":0.17424,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-w8p2-r796-3vmq","url":"https://osv.dev/vulnerability/GHSA-w8p2-r796-3vmq","summary":"Authlib OAuth 2.0 has Open Redirect in Authorization API that allows attacker-controlled redirect_uri through unsupported response_type","modified":"2026-07-18T17:30:29.215396840Z","packages":[{"ecosystem":"PyPI","name":"authlib","purl":"pkg:pypi/authlib","ranges":["<1.6.10"],"fixed":["1.6.10"]},{"ecosystem":"PyPI","name":"authlib","purl":"pkg:pypi/authlib","ranges":[">=1.7.0 <1.7.1"],"fixed":["1.7.1"]}]},{"id":"PYSEC-2026-2119","url":"https://osv.dev/vulnerability/PYSEC-2026-2119","summary":"","modified":"2026-07-13T07:15:15.617934943Z","packages":[{"ecosystem":"PyPI","name":"authlib","purl":"pkg:pypi/authlib","ranges":["<1.6.10"],"fixed":["1.6.10"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}