CVE-2026-110862
Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | better-auth |
| Product | better-auth |
| Published | Oct 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
better-auth / better-auth
1.4.0-beta.18 < 1.7.7
References
Credits
🔍 rick-v12 🔍 bazumo