Vulnerability in Better-Auth
CVE-2026-67337
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Better-Auth — versions 0, 1.4.9
Weakness classification (CWE)
References
- github.com/better-auth/better-auth/security/advisories/GHSA-xg6x-h9c9-2m83 (vendor-advisory)
- www.vulncheck.com/advisories/better-auth-before-two-factor-authentication-bypas… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-67337?
- CVE-2026-67337 is a medium-severity vulnerability in Better-Auth, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 6.5/10. Published 2026-08-01.
- How severe is CVE-2026-67337?
- Medium severity. CVSS v3 base score is 6.5 out of 10.