Open Redirect Affecting @auth0/nextjs-auth0 package, versions <4.32.0
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-AUTH0NEXTJSAUTH0-20936946
- published14 Oct 2026
- disclosed13 Oct 2026
- creditUnknown
Introduced: 13 Oct 2026
NewCVE-2026-107369 (opens in a new tab)How to fix?
Upgrade @auth0/nextjs-auth0 to version 4.32.0 or higher.
Overview
@auth0/nextjs-auth0 is a Next.js SDK for signing in with Auth0
Affected versions of this package are vulnerable to Open Redirect via the returnTo parameter, where the SDK validates it as a same-origin URL but the subsequent reconstruction logic can produce a URL that browsers interpret as an absolute or scheme-relative path. An attacker can craft a link that initiates an authentication flow with a malicious returnTo value, causing the post-authentication redirect to send the user to an unintended external domain.
Note: This is only exploitable when a user initiates an authentication flow using a link configured with a custom returnTo parameter.