CVE-2026-44681: Authlib

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.12 and 1.7.1, an unauthenticated open redirect in Authlib's OpenIDImplicitGrant and OpenIDHybridGrant authorization endpoint lets a remote attacker cause the authorization server to issue an HTTP 302 to an attacker-chosen URL by submitting an authorization request that omits the openid scope. This vulnerability is fixed in 1.6.12 and 1.7.1.

Affected products

• Authlib Authlib: before 1.6.12 (fixed in 1.6.12); version 1.7.0 only

Published 2026-05-27. Last modified 2026-06-17.