CVE-2026-110864 Better Auth 1.5.0-beta.12 before 1.7.7 Authentication Bypass via OAuth Proxy
Attackers can bypass authentication and take over accounts by forging encrypted profiles when the OAuth Proxy plugin shares a global secret.
- 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-2026-110864?
CVE-2026-110864 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 1.5.0-beta.12 before 1.7.7 contains an authentication bypass vulnerability in the OAuth Proxy plugin that allows unauthenticated attackers to sign in as other users by forging encrypted profiles. When the proxy shares the global secret and cookie-stored state is used, attackers can obtain encrypted state for a fake profile with a victim's verified email to take over the account via implicit linking.
Weakness: CWE-287
Which versions are affected by CVE-2026-110864?
2 open source packages ship an affected version, including better-auth.
| Package | Affected | Fixed in |
|---|---|---|
better-auth npm | From 1.5.0-beta.12 | 1.7.7 |
better-auth npm | From 1.5.0-beta.12 | 1.7.7 |
How do I fix CVE-2026-110864?
Upgrade better-auth to 1.7.7 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-110864 being exploited?
There is no known exploitation of CVE-2026-110864 in the wild and no public exploit code.
Sources
Also known as GHSA-r4xp-prcw-77qf, GHSA-w232-44q8-h37x.