CVE-2026-67337: Better-Auth

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Better-Auth Better-Auth: before 1.4.9 (fixed in 1.4.9)

Published 2026-08-01. Last modified 2026-09-08.