CVE-2026-110864
Better Auth 1.5.0-beta.12 before 1.7.7 Authentication Bypass via OAuth Proxy
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | better-auth |
| Product | better-auth |
| Published | Oct 14, 2026 |
Stay Ahead of the Next One
Get instant alerts for better-auth better-auth
Be the first to know when new high vulnerabilities affecting better-auth better-auth are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
better-auth / better-auth
1.5.0-beta.12 < 1.7.7
References
Credits
🔍 iabdullah215 🔍 martinfrancois