Open Redirect Affecting better-auth package, versions <1.1.6
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-8554003
- published31 Dec 2024
- disclosed30 Dec 2024
- creditjamesjulich
Introduced: 30 Dec 2024
NewCVE-2024-56734 (opens in a new tab)How to fix?
Upgrade better-auth to version 1.1.6 or higher.
Overview
better-auth is a The most comprehensive authentication library for TypeScript.
Affected versions of this package are vulnerable to Open Redirect via the auth/verify-email endpoint, due to improper validation of callbackURL parameter through the originCheckMiddleware function.
Note: This vulnerability impacts users relying on email verification links generated by the library.
Workaround
const auth = betterAuth({
hooks: {
before: (ctx) => {
if (ctx.path === "/verify-email") {
const callbackURL = ctx.query.callbackURL; // Check if this is a trusted callback URL or not
}
}
}
})
PoC
https://example.com/auth/verify-email?token=abcd1234&callbackURL=https://malicious-site.com