better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookieCache is enabled. (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.
AI Analysis
Technical Summary
The vulnerability in better-auth prior to version 1.4.9 involves a two-factor authentication bypass triggered when the session.cookieCache feature is enabled. This flaw allows attackers possessing valid primary credentials to circumvent the second-factor authentication step by exploiting the premature caching of session data, effectively granting access to authenticated routes without completing the full authentication process. The issue is classified under CWE-288 (Authentication Bypass).
Potential Impact
An attacker with valid primary credentials can bypass the second-factor authentication requirement, potentially gaining unauthorized access to protected resources. The confidentiality of the system is impacted (high impact), but integrity and availability are not affected. This could lead to unauthorized access despite two-factor authentication controls being in place.
Mitigation Recommendations
No official patch or fix is currently confirmed for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, it is recommended to disable the session.cookieCache feature if possible to prevent exploitation of this bypass vulnerability.
better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookieCache is enabled. (CVE-2026-67337)
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.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/better-auth/better-authRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in better-auth prior to version 1.4.9 involves a two-factor authentication bypass triggered when the session.cookieCache feature is enabled. This flaw allows attackers possessing valid primary credentials to circumvent the second-factor authentication step by exploiting the premature caching of session data, effectively granting access to authenticated routes without completing the full authentication process. The issue is classified under CWE-288 (Authentication Bypass).
Potential Impact
An attacker with valid primary credentials can bypass the second-factor authentication requirement, potentially gaining unauthorized access to protected resources. The confidentiality of the system is impacted (high impact), but integrity and availability are not affected. This could lead to unauthorized access despite two-factor authentication controls being in place.
Mitigation Recommendations
No official patch or fix is currently confirmed for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, it is recommended to disable the session.cookieCache feature if possible to prevent exploitation of this bypass vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-8pwm-pjg9-4h92
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-67337"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a6e6292bf32cb7a344f5ef4
Added to database: 08/01/2026, 21:18:10 UTC
Last enriched: 08/01/2026, 21:20:17 UTC
Last updated: 09/15/2026, 22:01:36 UTC
Views: 72
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