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.

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 verif…

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.

Affected products

Better-auth — versions 0, 1.4.9

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (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.