shawfactor

AJAX requests to this site from another (those containing an Origin header) will be allowed for any domain in your multisite setup, no configuration required
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LH Multisite CORS

Allows AJAX requests from other sites in your multisite network even if they are on another domain or subdomain

No Frills Plugins

RSS CORS Enable is a simple yet powerful plugin designed to solve the common problem of accessing WordPress RSS feeds from different origins. By default, accessing WordPress RSS feeds via JavaScript from a domain different than the one where WordPress is hosted can result in Cross-Origin Resource Sharing (CORS) errors. This plugin addresses this issue by adding an <code>Access-Control-Allow-Origin: *</code> header to your WordPress RSS feed, making it accessible from any origin.

RSS CORS Enable

This plugin adds the necessary CORS (Cross-Origin Resource Sharing) header to your WordPress RSS feed, allowing it to be accessed from any origin.

LH Multisite CORS vs RSS CORS Enable