CVE-2026-41427— Better Auth OAuth 2.1 Provider: Unprivileged users can register OAuth clients
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I. Basic Information for CVE-2026-41427
Vulnerability Information
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Vulnerability Title
Better Auth OAuth 2.1 Provider: Unprivileged users can register OAuth clients
Source: NVD (National Vulnerability Database)
Vulnerability Description
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
Better Auth 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Better Auth是Better Auth开源的一个 TypeScript 最全面的身份验证框架。 Better Auth 1.6.5之前版本存在安全漏洞，该漏洞源于clientPrivileges选项记录了创建操作，但OAuth客户端创建端点未在持久化新客户端前调用钩子，导致任何经过身份验证的用户都能创建OAuth客户端并设置攻击者选择的重定向URI和元数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| better-auth | better-auth | >= 1.4.8-beta.7, < 1.6.5 | - | |
| better-auth | oauth-provider | >= 1.4.8-beta.7, < 1.6.5 | - |
II. Public POCs for CVE-2026-41427
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|---|
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IV. Related Vulnerabilities
Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-863
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