CVE-2026-53516 Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts emailverified: true without requiring the local user row's emailVerified...

CVE-2026-53516

Summary: CVE-2026-53516 affects Better Auth (

Better Auth has an account takeover issue via OAuth auto-link to unverified pre-registered email

Am I affected? Users are affected if all of the following are true: - Their application uses better-auth at a version 1.6.11 on the stable line, or any current next pre-release. - emailAndPassword.enabled: true is set in their application's betterAuth ... configuration. - At least one OAuth or SS...

PT-2026-56300

Name of the Vulnerable Software and Affected Versions Better Auth versions prior to 1.6.11 Description Better Auth contains a pre-account hijacking flaw where the OAuth callback auto-link gate in the handleOAuthUserInfo function allows implicit account linking if the OAuth provider asserts email...