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CVE-2026-41427— Better Auth OAuth 2.1 Provider: Unprivileged users can register OAuth clients

Quick assessment

Affected
better-auth better-auth
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.

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。

AI Predicted 7.5 Difficulty: Easy EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
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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III. Intelligence Information for CVE-2026-41427

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Vendor Advisories for CVE-2026-41427 (1)

IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-863