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CVE-2026-53516

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.

CVSS 8.3 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • better-auth

    Versions
    • < 1.6.11: Affected

    No fix published

  • better-auth npm

    Affected ranges
    • SEMVER: < 1.6.11

    Update to 1.6.11

Original sources

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