CVE-2026-44681

Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization

State: Published
Severity: 6.1 Medium
Published: May 27, 2026
Updated: Jun 2, 2026
Reserved: May 7, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	GitHub_M

Weaknesses

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
authlibauthlib	< 1.6.12Affected >= 1.7.0, < 1.7.1Affected

References

https://github.com/authlib/authlib/security/advisories/GHSA-r95x-qfjj-fjj2

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