This tutorial is very similar to our tutorial on updating any WordPress plugin: How To Update a WordPress Plugin
Step 1: Login to WordPress as AdministratorHopefully, you’re already well-versed in logging into your WordPress site as an administrator!
Step 2: Access UpdatesIf there is an update for a plugin or a theme, then you’ll likely have a number in the top bar and next to Updates as shown below (the number 5). Click on Updates!
Step 3: Update the PluginsCheck the boxes of the plugins you’d like to updated and click on Update Plugins: And at the end of the update process you should receive something similar to, All updates have been completed.
Step 4: Verify the UpdateIf you want to be absolutely sure your version is updated, you can click on Plugins and then verify that WP Super Cache is at least version 1.4.4 For further reading, the following links Cross Site Scripting and WP Super Cache can be consulted for more information.