Insufficient Verification of Data Authenticity

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity in the authentication process. An attacker can gain persistent unauthorized access to user accounts by...

Time-of-check Time-of-use (TOCTOU) Race Condition

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Time-of-check Time-of-use TOCTOU Race Condition through a race condition in the authorizationcode grant handler. An attacker can obtain multiple valid access...

Authentication Bypass Using an Alternate Path or Channel

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel in the handleOAuthUserInfo. An attacker can gain unauthorized access to user accounts by...

CVE-2025-61928

CVE-2025-61928 affects Better Auth (TypeScript) prior to version 1.3.26. The vulnerability allows unauthenticated attackers to create or modify API keys for any user by supplying the target user’s id in the request body to api/auth/api-key/create (and similarly in the update endpoint). The issue ...

The vulnerability of the TypeScript-based authentication library Better Auth, related to the lack of protective measures for website structure, allows attackers to perform cross-site scripting attacks.

The vulnerability of the TypeScript-based authentication library Better Auth relates to the lack of measures taken to protect the website structure when processing the error parameter. Exploiting this vulnerability allows a malicious actor to perform cross-site scripting attacks remotely...