Cross-site Request Forgery (CSRF) Affecting better-auth package, versions <1.6.2
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-16722768
- published17 May 2026
- disclosed15 May 2026
- creditJvr, Piia
Introduced: 15 May 2026
CVE-2026-67335 (opens in a new tab)How to fix?
Upgrade better-auth to version 1.6.2 or higher.
Overview
better-auth is a The most comprehensive authentication library for TypeScript.
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) when building an errorURL in parseGenericState, when the storeStateStrategy is set to "cookie" and PKCE is disabled. An attacker can gain unauthorized access to a victim's session or link their external account to the victim's authenticated account by convincing a user to follow a malicious OAuth callback URL with a forged state and arbitrary code, while the target browser holds a valid oauth_state cookie.
Workaround
This vulnerability can be avoided by setting the storeStateStrategy to "database" or enabling PKCE (pkce: true) on all affected OAuth providers.