CVE-2021-43812: AUTH0 Nextjs-AUTH0

Medium severity, CVSS 6.1. EPSS: 0.7% 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 before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.

Affected products

• AUTH0 Nextjs-AUTH0: before 1.6.2 (fixed in 1.6.2)

Published 2021-12-16. Last modified 2026-06-17.