CVE-2026-44681
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductAuthlib
PublishedMay 27, 2026
First seenMay 27, 2026
Weakness typeCWE-601Open redirectCWE-863Incorrect authorization
How to fix
Update
- authlib authlib1.6.12 or later
- authlib1.7.1, 1.6.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| authlib authlib | v < 1.6.12, 1.7.0 | 1.6.12 |
| authlibPyPI | 1.7.0 ≤ v < 1.7.1, v < 1.6.12 | 1.7.1, 1.6.12 |
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