CVE-2024-56734 Better Auth has an Open Redirect Vulnerability in Verify Email Endpoint
Attackers can redirect users to malicious sites via the verify email endpoint due to missing domain validation, affecting Better Auth users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-56734?
CVE-2024-56734 is a high-severity vulnerability in better-auth, published on 30 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Better Auth is an authentication library for TypeScript. An open redirect vulnerability has been identified in the verify email endpoint of all versions of Better Auth prior to v1.1.6, potentially allowing attackers to redirect users to malicious websites. This issue affects users relying on email verification links generated by the library. The verify email callback endpoint accepts a `callbackURL` parameter. Unlike other verification methods, email verification only uses JWT to verify and redirect without proper validation of the target domain. The origin checker is bypassed in this scenario because it only checks for `POST` requests. An attacker can manipulate this parameter to redirect users to arbitrary URLs controlled by the attacker. Version 1.1.6 contains a patch for the issue.
Weakness: CWE-601
Which versions are affected by CVE-2024-56734?
2 open source packages ship an affected version, including better-auth. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
better-auth npm | All versions | 1.1.6 |
better-auth npm | All versions | 1.1.6 |
Products include Better-Auth Better Auth.
How do I fix CVE-2024-56734?
Upgrade better-auth to 1.1.6 or later.
Is CVE-2024-56734 being exploited?
There is no known exploitation of CVE-2024-56734 in the wild and no public exploit code.
Other vulnerabilities in better-auth
- CVE-2026-53512 Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins
- CVE-2026-53516 Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email
- CVE-2026-53514 Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin
- CVE-2026-45337 Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending
- CVE-2025-27143 Beter Auth has an Open Redirect via Scheme-Less Callback Parameter
Sources
Also known as GHSA-8jhw-6pjj-8723.