CVE-2026-44681: Authlib OIDC Implicit/Hybrid Authorization Vulnerable to Open Redirect

May 13, 2026

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.

References

github.com/advisories/GHSA-r95x-qfjj-fjj2
github.com/authlib/authlib/releases/tag/v1.6.12
github.com/authlib/authlib/releases/tag/v1.7.1
github.com/authlib/authlib/security/advisories/GHSA-r95x-qfjj-fjj2
nvd.nist.gov/vuln/detail/CVE-2026-44681

Code Behaviors & Features

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