What’s Vulnerable › Vulnerabilities

CVE-2026-110864: Better Auth 1.5.0-beta.12 before 1.7.7 Authentication Bypass via OAuth Proxy

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-16
• Weakness: CWE-287

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.

Affected products

• Npm Better-Auth: from 1.5.0-beta.12 before 1.7.7 — fixed in 1.7.7
• better-auth: from 1.5.0-beta.12 before 1.7.7 — fixed in 1.7.7

How to fix

Upgrade to a fixed version: Npm Better-Auth 1.7.7; better-auth 1.7.7. Check the vendor advisory for mitigations.

References

• https://github.com/better-auth/better-auth/security/advisories/GHSA-r4xp-prcw-77qf
• https://www.vulncheck.com/advisories/better-auth-1.5.0-beta.12-before-1.7.7-authentication-bypass-via-oauth-proxy

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