PT-2026-67317 · Unknown · Better Auth

Tridecent · CVE-2026-67337 · Published 2026-04-03 · Updated 2026-08-01

Positive Technologies (AI Summary)

CVSS v4.0

7.1

High

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions better-auth versions prior to 1.4.9

Description A two-factor authentication (2FA) bypass occurs when session.cookieCache is enabled. The issue arises because the session generated during the initial sign-in step may be cached as valid before the second-factor verification is completed. Consequently, subsequent session lookups may return this cached session without re-evaluating the 2FA requirement, allowing an attacker with valid primary credentials to access authenticated routes without completing the second authentication factor.

Recommendations Update to version 1.4.9 or later. As a temporary workaround, disable session.cookieCache when using two-factor authentication.

Exploit

Fix

Authentication Bypass Using an Alternate Path or Channel

Weakness Enumeration

CWE-288

Related Identifiers

CVE-2026-67337

GHSA-XG6X-H9C9-2M83

Affected Products

Better Auth

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67337.json · Exploit
• https://github.com/better-auth/better-auth/security/advisories/GHSA-xg6x-h9c9-2m83 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-xg6x-h9c9-2m83 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-67337 · Security Note
• https://osv.dev/vulnerability/CVE-2026-67337 · Vendor Advisory
• https://github.com/better-auth/better-auth · Note
• https://vulncheck.com/advisories/better-auth-before-two-factor-authentication-bypass-via-session-cookiecache · Note