Medium severity · published Aug 1, 2026
CVE-2026-67337
better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookieCache is enabled. Attackers with valid primary credentials can access authenticated routes without completing second-factor verification by exploiting premature session caching.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BE
better-auth · better-auth
before 1.4.9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67337
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67337
github.com
https://github.com/better-auth/better-auth/security/advisories/GHSA-xg6x-h9c9-2m83
www.vulncheck.com
https://www.vulncheck.com/advisories/better-auth-before-two-factor-authentication-bypass-via-session-cookiecache
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