CVE-2026-53516
HIGH
8.3
CVSS 3.1
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.
Metadata
Severity & Metrics
8.3
HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
SSVC — CISA Coordinator
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| better-auth | better-auth | — | < 1.6.11 |
Weakness (CWE)
CVSS scores (1)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 8.3 | HIGH | 3.1 | cna | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L |
References (4)
- https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7 https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7
- https://github.com/better-auth/better-auth/pull/9578 https://github.com/better-auth/better-auth/pull/9578
- https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563 https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563
- https://github.com/better-auth/better-auth/releases/tag/v1.6.11 https://github.com/better-auth/better-auth/releases/tag/v1.6.11