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.
How to fix
- authlib authlib1.6.10 or later
- authlib1.6.10, 1.7.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| authlib authlib | v < 1.6.10, 1.7.0 | 1.6.10 |
| authlibPyPI | v < 1.6.10, 1.7.0 ≤ v < 1.7.1 | 1.6.10, 1.7.1 |
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