python-authlib: Authlib is a Python library which builds OAuth and OpenID Connect servers
CVE-2026-116672 is fixed in python-authlib on 1 platform by DEBIAN-CVE-2026-116672 (version 1.9.1-1), released October 31, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-authlib · Debian 14 | 1.9.1-1 | DEBIAN-CVE-2026-116672 | Oct 31, 2026 |
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