CVE-2026-116672

Authlib is a Python library which builds OAuth and OpenID Connect servers. From 0.15 until 1.9.1, the documented ClientConfigurationEndpoint.authenticate_client and ClientConfigurationEndpoint.check_permission reference implementations look up a target client from request-controlled client_id data and check only whether that target is editable, without verifying that request.credential belongs to the target client. Deployments following both examples can allow a client holding any valid registration access token to read, modify, or delete another client's registration. Changing redirect_uris can enable authorization code or token interception, while deleting registrations can deny service to affected clients. This issue is fixed in version 1.9.1.

• CWE-639
• CWE-1188

• https://github.com/authlib/authlib/commit/1bd2a313492ce0a4d0571c150730907aa3fc91ff
• https://github.com/authlib/authlib/releases/tag/v1.9.1
• https://github.com/authlib/authlib/security/advisories/GHSA-c73q-w75p-j82v

Published

Oct 27, 2026

Last Modified

Oct 27, 2026

Status

Awaiting Analysis

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