CVE-2026-41479

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.

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Produits concernés

• authlib
• Authlib authlib

Scores CVSS

Faiblesses (CWE)

• CWE-601

Références

• https://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab096 Patch
• https://github.com/authlib/authlib/security/advisories/GHSA-w8p2-r796-3vmq ExploitVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories