CVE WatchJul 21, 2026

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 h

CVSS

8.3

High

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: Jul 15, 2026 · Last modified: Jul 21, 2026 · CWE-287 · CWE-345

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-08-092026-09-06

Technical 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.

Official references

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