Authentication Bypass Using an Alternate Path or Channel Affecting better-auth package, versions <1.4.9
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-BETTERAUTH-15876756
- published3 Apr 2026
- disclosed3 Apr 2026
- creditTriDecent
Introduced: 3 Apr 2026
CVE-2026-67337 (opens in a new tab)How to fix?
Upgrade better-auth to version 1.4.9 or higher.
Overview
better-auth is a The most comprehensive authentication library for TypeScript.
Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel in the session.cookieCache component. An attacker can gain unauthorized access to protected application routes by leveraging a session that is cached as valid before all authentication steps, such as two-factor authentication, are completed.
Note:
This is only exploitable if both two-factor authentication and session cookie caching are enabled.
Workaround
This vulnerability can be mitigated by disabling session.cookieCache when two-factor authentication is in use.