CVE-2021-32702

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.

• CWE-79
• CWE-79

• https://github.com/auth0/nextjs-auth0/commit/6996e2528ceed98627caa28abafbc09e90163ccfPatch, Third Party Advisory
• https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-954c-jjx6-cxv7Third Party Advisory
• https://www.npmjs.com/package/%40auth0/nextjs-auth0
• https://github.com/auth0/nextjs-auth0/commit/6996e2528ceed98627caa28abafbc09e90163ccfPatch, Third Party Advisory
• https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-954c-jjx6-cxv7Third Party Advisory
• https://www.npmjs.com/package/%40auth0/nextjs-auth0

Published

Jun 25, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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