CVE-2026-67337

HIGH7.1

better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache

Published Aug 1, 2026

Modified 2 months ago

Details

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.

References

ADVISORY

https://github.com/better-auth/better-auth/security/advisories/GHSA-xg6x-h9c9-2m83

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-67337

ADVISORY

https://www.vulncheck.com/advisories/better-auth-before-two-factor-authentication-bypass-via-session-cookiecache

CVSS Analysis

CVSS v4.0

7.1

Exploitability

Attack Vector