---
title: "Why do I receive a CORS error when I try to access my Catalyst application that is embedded as an iFrame?"
url: https://docs.catalyst.zoho.com/en/faq/cloud-scale/authentication-cors/
description: "You will receive this error if necessary authorization is not provided. To avoid encountering a CORS error, you will need to authorize the domain and enable …"
last_updated: 2026-11-13T05:00:22Z
service: CloudScale
type: faq
---

You will receive this error if necessary authorization is not provided. To avoid encountering a CORS error, you will need to authorize the domain and enable CORS and iFrame access. You can learn about adding and authorizing domains from this help section.