How severe is CVE-2021-32702?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 6.1 out of 10.

What type of vulnerability is CVE-2021-32702?

This is classified as CWE-79, which is a common weakness in software security.

CVE-2021-32702 - MEDIUM Severity | CVSS 6.1

Vulnerability Description

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before and including `1.4.1` are vulnerable to reflected XSS. An attacker can execute arbitrary code by providing an XSS payload in the `error` query parameter which is then processed by the callback handler as an error message. You are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `1.4.1` or lower **unless** you are using custom error handling that does not return the error message in an HTML response. Upgrade to version `1.4.1` to resolve. The fix adds basic HTML escaping to the error message and it should not impact your users.

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