CVE-2025-67716: AUTH0 Nextjs-AUTH0

Medium severity, CVSS 5.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• AUTH0 Nextjs-AUTH0: from 4.9.0, before 4.12.1 (fixed in 4.12.1)

Published 2025-12-11. Last modified 2026-06-17.