Vulnerability · Published Aug 1, 2026 · Assigned by VulnCheck
CVE-2026-67337better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache
Medium 6.5
In plain English
A medium-severity authentication bypass in better-auth from better-auth. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 59.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | better-auth | 1.4.9 | GHSA-xg6x-h9c9-2m83 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| better-auth | better-auth | 0 – before 1.4.9 |
Weakness: CWE-288 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- GitHub Security Advisory (GHSA-xg6x-h9c9-2m83) vendor-advisory
- VulnCheck Advisory: better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache third-party-advisory