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CVE-2025-61928— Better Auth: Unauthenticated API key creation through api-key plugin

Quick assessment

Affected
better-auth better-auth
Exploitation
High exploitation probability; assess promptly
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 1.3.26之前版本存在安全漏洞，该漏洞源于未经验证的攻击者可通过请求体中用户ID绕过身份验证，可能导致身份验证绕过和权限提升。

AI Predicted 9.8 Difficulty: Easy EPSS 19.72% · P97
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I. Basic Information for CVE-2025-61928

Vulnerability Information
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Vulnerability Title
Better Auth: Unauthenticated API key creation through api-key plugin
Source: CVE Program / CVE List V5
Vulnerability Description
Better Auth is an authentication and authorization library for TypeScript. In versions prior to 1.3.26, unauthenticated attackers can create or modify API keys for any user by passing that user's id in the request body to the `api/auth/api-key/create` route. `session?.user ?? (authRequired ? null : { id: ctx.body.userId })`. When no session exists but `userId` is present in the request body, `authRequired` becomes false and the user object is set to the attacker-controlled ID. Server-only field validation only executes when `authRequired` is true (lines 280-295), allowing attackers to set privileged fields. No additional authentication occurs before the database operation, so the malicious payload is accepted. The same pattern exists in the update endpoint. This is a critical authentication bypass enabling full an unauthenticated attacker can generate an API key for any user and immediately gain complete authenticated access. This allows the attacker to perform any action as the victim user using the api key, potentially compromise the user data and the application depending on the victim's privileges. Version 1.3.26 contains a patch for the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
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 1.3.26之前版本存在安全漏洞，该漏洞源于未经验证的攻击者可通过请求体中用户ID绕过身份验证，可能导致身份验证绕过和权限提升。
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 < 1.3.26 -

II. Public POCs for CVE-2025-61928

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III. Intelligence Information for CVE-2025-61928

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IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-285