---
id: CVE-2026-67337
title: >-
  better-auth versions before 1.4.9 contain a two-factor authentication bypass
  vulnerability when session.cookieCache is enabled
summary: >-
  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 ver…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-288
published: '2026-08-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:34:34.997'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67337'
references:
  - url: >-
      https://github.com/better-auth/better-auth/security/advisories/GHSA-xg6x-h9c9-2m83
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/better-auth-before-two-factor-authentication-bypass-via-session-cookiecache
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00269
epssPercentile: 0.19319
ingestedAt: '2026-08-02T09:18:11.484Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.