GitHub Security Advisory (GHSA-xg6x-h9c9-2m83)Vendor advisory
https://github.com/better-auth/better-auth/security/advisories/GHSA-xg6x-h9c9-2m83 CVE-2026-67337
HIGH
better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache
Record summary
CVE-2026-67337 has a selected CVSS score of 7.1 (high).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 3, 2026 · Source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
better-authBrowse better-auth / better-authDefault status: unaffected | CVE List | Before 1.4.9 | affected |
| 1.4.9 | unaffected |
References
3nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-67337 VulnCheck Advisory: better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCacheThird-party advisory
https://www.vulncheck.com/advisories/better-auth-before-two-factor-authentication-bypass-via-session-cookiecache