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CVE-2026-116672— Authlib RFC 7592 examples omit registration-access-token client binding

Quick assessment

Affected
authlib authlib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Authlib 是一个用于构建 OAuth 和 OpenID Connect 服务器的 Python 库。在从 0.15 到 1.9.1 的版本中，文档中提供的 和 参考实现会从由请求控制的 数据中查找目标客户端，并仅检查该目标客户端是否可编辑，却未验证请求中的 是否属于该目标客户端。遵循这两个示例的部署环境，允许持有任意有效注册访问令牌（registration access token）的客户端读取、修改或删除其他客户端的注册信息。通过更改 ，攻击者可实施授权码或令牌的拦截；而删除注册信息则会导致受影响客户端的

CVSS 8.8 · High
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I. Basic Information for CVE-2026-116672

Vulnerability Information
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Vulnerability Title
Authlib RFC 7592 examples omit registration-access-token client binding
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
authlib authlib >= 0.15, < 1.9.1 -

II. Public POCs for CVE-2026-116672

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III. Intelligence Information for CVE-2026-116672

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Vendor Pages for CVE-2026-116672 (1)

Other References for CVE-2026-116672 (2)

IV. Related Vulnerabilities

Same product: authlib
Same vendor: authlib
Same weakness: CWE-639