CVE-2026-110862 Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
Attackers can bypass authentication and take over accounts by reusing OAuth state values as Magic Link tokens in Better Auth.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-110862?
CVE-2026-110862 is a critical authentication bypass vulnerability in better-auth, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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-287
Which versions are affected by CVE-2026-110862?
How do I fix CVE-2026-110862?
No fix has been published for CVE-2026-110862 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-110862 being exploited?
There is no known exploitation of CVE-2026-110862 in the wild and no public exploit code.
Sources
Also known as GHSA-p7w7-v3vp-w8x8.