9.1Critical
CVE-2026-110862Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
Description
Better Auth from 1.4.0-beta.18 before 1.7.7 contains an authentication bypass vulnerability that allows unauthenticated attackers to sign in as other users by reusing OAuth state values as Magic Link tokens. Attackers can start an OAuth sign-in with a victim's email and submit the returned state to Magic Link verification, gaining sessions or creating falsely email-verified accounts.
Weakness (CWE):
CWE-287
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| better-auth | better-auth | 1.4.0-beta.18 – < 1.7.7, fixed 1.7.7 |
References and patches
- GitHub Security Advisory (GHSA-965c-763c-88jm) vendor-advisory
- VulnCheck Advisory: Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link third-party-advisory