CVE-2025-67716

17th percentile - higher than 17% of all known CVEs

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions 4.9.0 through 4.12.1 contain an input-validation flaw in the returnTo parameter, which could allow attackers to inject unintended OAuth query parameters into the Auth0 authorization request. Successful exploitation may result in tokens being issued with unintended parameters. This issue is fixed in version 4.13.0.

Successful exploitation may result in tokens being issued with unintended parameters, potentially leading to unauthorized access or privilege escalation. The issue affects applications using vulnerable SDK versions.

Update the Auth0 Next.js SDK to version 4.13.0 or later, which fixes this issue. Verify that the application does not use vulnerable versions.