Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Authlib | Authlib | < 1.6.10 |
Related Weaknesses (CWE)
References
- https://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab0Patch
- https://github.com/authlib/authlib/security/advisories/GHSA-w8p2-r796-3vmqExploitVendor Advisory
FAQ
What is CVE-2026-41479?
CVE-2026-41479 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 whe...
How severe is CVE-2026-41479?
CVE-2026-41479 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-41479?
Check the references section above for vendor advisories and patch information. Affected products include: Authlib Authlib.