Auth bypass in Better-auth

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…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-53516?
CVE-2026-53516 is a high-severity vulnerability in Better-auth, classified under Improper Authentication. CVSS score: 8.3/10. Published 2026-07-15.
How severe is CVE-2026-53516?
High severity. CVSS v3 base score is 8.3 out of 10.