CVE-2026-67337
Received Received - Intake

Two-Factor Authentication Bypass in Better-Auth

Publication date: 2026-08-01

Last updated on: 2026-08-01

Assigner: VulnCheck

Description
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.

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Meta Information

Published
2026-08-01
Last Modified
2026-08-01
Generated
2026-08-01
AI Q&A
2026-08-01
EPSS Evaluated
N/A
NVD
CVE-2026-67337
EUVD
EUVD-2026-51837

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
better-auth better-auth to 1.4.9 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-288 The product requires authentication, but the product has an alternate path or channel that does not require authentication.

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Executive Summary

This vulnerability is a two-factor authentication bypass in better-auth versions before 1.4.9. When session.cookieCache is enabled, attackers with valid primary credentials can access authenticated routes without completing second-factor verification by exploiting premature session caching.

Detection Guidance

Check if session.cookieCache is enabled in better-auth configurations. Inspect session handling logic for premature caching before second-factor verification. Review authentication logs for routes accessed without completing 2FA.

Impact Analysis

Attackers could gain unauthorized access to sensitive accounts or data protected by two-factor authentication, even if they only have the primary credentials. This could lead to data breaches, unauthorized transactions, or other malicious activities.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA, as unauthorized access to personal or health data violates their strict confidentiality and security requirements. Organizations may face legal penalties and reputational damage.

Mitigation Strategies

Upgrade better-auth to version 1.4.9 or later. Disable session.cookieCache if enabled. Implement stricter session validation to ensure 2FA completion before granting access.

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