CVE-2025-27143— Beter Auth has an Open Redirect via Scheme-Less Callback Parameter

Beter Auth has an Open Redirect via Scheme-Less Callback Parameter

Better Auth is an authentication and authorization library for TypeScript. Prior to version 1.1.21, the application is vulnerable to an open redirect due to improper validation of the callbackURL parameter in the email verification endpoint and any other endpoint that accepts callback url. While the server blocks fully qualified URLs, it incorrectly allows scheme-less URLs. This results in the browser interpreting the URL as a fully qualified URL, leading to unintended redirection. An attacker can exploit this flaw by crafting a malicious verification link and tricking users into clicking it. Upon successful email verification, the user will be automatically redirected to the attacker's website, which can be used for phishing, malware distribution, or stealing sensitive authentication tokens. This CVE is a bypass of the fix for GHSA-8jhw-6pjj-8723/CVE-2024-56734. Version 1.1.21 contains an updated patch.

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指向未可信站点的URL重定向(开放重定向)

Better Auth 输入验证错误漏洞

Better Auth是Better Auth开源的一个 TypeScript 最全面的身份验证框架。 Better Auth 1.1.21之前版本存在输入验证错误漏洞，该漏洞源于电子邮件验证端点和任何其他接受回调url的端点中对callbackURL参数验证不当。

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