CVE-2026-114607 better-auth: OAuth state can be used as a Magic Link to sign in as another user
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-114607?
CVE-2026-114607 is a critical vulnerability in better-auth, published on 22 Oct 2026.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-114607?
How do I fix CVE-2026-114607?
Upgrade to a fixed version.
Is CVE-2026-114607 being exploited?
There is no known exploitation of CVE-2026-114607 in the wild and no public exploit code.