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EUVD-2026-263237

fkie_cve-2025-67716

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.

GHSA-mr6f-h57v-rpj5 — Improper Validation of Query Parameters in Auth0 Next.js SDK

Affected: npm: @auth0/nextjs-auth0

### Description An input-validation flaw in the returnTo parameter in the Auth0 Next.js SDK 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

### Am I Affected? You are affected if you meet the following preconditions: - Applications using the auth0/nextjs-auth0 SDK version prior to 4.13.0

### Affected product and versions Auth0/nextjs-auth0 versions >= 4.9.0 and < 4.13.0

### Resolution Upgrade Auth0/nextjs-auth0 version to v4.13.0

### Acknowledgements Okta would like to thank Joshua Rogers (MegaManSec) for their discovery and responsible disclosure.