CVE-2026-114607 Better Auth - Authentication Bypass

Better Auth 1.4.0-beta.18 to 1.7.7 contains an authentication bypass caused by OAuth sign-in state and Magic Link token collision in verification records, letting unauthenticated attackers obtain sessions or create verified accounts, exploit requires specific configuration settings.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-287

Vendor fix

Update to version 1.7.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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