ivanblagdan

A simple plugin to disable loading of jquery-migrate on the frontend due to a XSS vulerability of jQuery Migrate 1.2.1. 
More details here: https://github.com/jquery/jquery-migrate/issues/36
It’s also one thing less to load where it counts.
Props to people in this thread: https://wordpress.org/support/topic/removing-the-default-jquery-and-migrate-from-the-header-in-last-version-of-wp?replies=6.

Disable jQuery Migrate

A simple plugin to disable loading of jquery-migrate on the frontend due to a XSS vulerability of jQuery Migrate 1.2.1.

wptomato

jQuery Migrate is a javascript library that allows you to preserve the compatibility of your jQuery code developed for versions of jQuery older than 1.9. It basically restores deprecated features and behaviors so that older code will still run properly on the current jQuery version and later.
Most websites that use up-to-date themes and plugins don’t require jQuery Migrate on the frontend, and thus the script can be safely removed. By removing it, the browser will have one less JavaScript file to download and execute. As a result, your site will load faster!
<a href="https://dotlayer.com/what-is-migrate-js-why-and-how-to-remove-jquery-migrate-from-wordpress/" rel="nofollow ugc">Read our article about jQuery Migrate and Website Optimization</a>.

Remove jQuery Migrate Safely

Completely removes the jQuery migrate script dependency safely from your WordPress website thereby improving page load speed on the frontend.

Disable jQuery Migrate vs Remove jQuery Migrate Safely