Vulnerability Description
Better Auth is an authentication and authorization library for TypeScript. From 1.4.0-beta.18 until 1.7.7, deployments that enable Magic Link with storeToken set to plain, or with storeToken set to hashed and the global verification.storeIdentifier setting also set to hashed, enable a built-in social or Generic OAuth provider, and use account.storeStateStrategy set to database can accept an OAuth sign-in state value as a Magic Link token. These settings can cause Magic Link verification records and OAuth state to resolve to the same stored identifier, allowing an unauthenticated attacker to start OAuth sign-in for a known email address and redeem the returned state through Magic Link without controlling the mailbox or completing the provider callback. The attacker can obtain a normal session for an existing user, or create an account incorrectly marked as email verified when sign-up is enabled. This issue is fixed in version 1.7.7.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/better-auth/better-auth/commit/ac54bfd67821a7607533af2059858b
- https://github.com/better-auth/better-auth/pull/11494
- https://github.com/better-auth/better-auth/releases/tag/v1.7.7
- https://github.com/better-auth/better-auth/security/advisories/GHSA-965c-763c-88
FAQ
What is CVE-2026-114607?
CVE-2026-114607 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Better Auth is an authentication and authorization library for TypeScript. From 1.4.0-beta.18 until 1.7.7, deployments that enable Magic Link with storeToken set to plain, or with storeToken set to ha...
How severe is CVE-2026-114607?
CVE-2026-114607 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-114607?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.