CVE-2026-116672
Description
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.
How to fix
- Authlib1.9.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| AuthlibPyPI | 0.15 ≤ v ≤ 1.9.0 | 1.9.1 |
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