CVE-2026-53516

Description

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.

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Produits concernés

• better-auth
• Better-auth better auth

Scores CVSS

Faiblesses (CWE)

• CWE-287
• CWE-345

Références

• https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563 Patch
• https://github.com/better-auth/better-auth/pull/9578 Issue TrackingPatch
• https://github.com/better-auth/better-auth/releases/tag/v1.6.11 Release Notes
• https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7 MitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories