CVE-2026-53516

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 v3 8.3 HIGH

8.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563	Patch
https://github.com/better-auth/better-auth/pull/9578	Issue Tracking Patch
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	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-07-15 18:16

Updated : 2026-07-21 14:14

NVD link : CVE-2026-53516

Mitre link : CVE-2026-53516

CVE.ORG link : CVE-2026-53516

JSON object : View

Products Affected

better-auth

better_auth

CWE

CWE-287

Improper Authentication

CWE-345

Insufficient Verification of Data Authenticity

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