BE REST Endpoints <= 1.0.0 - Unauthenticated Stored XSS and Widget Manipulation

Description

The plugin does not perform any authorization check before allowing widgets to be read, created, updated and deleted, and does not sanitize the values it stores in them, allowing unauthenticated users to inject arbitrary web scripts which will execute in the browser of any user visiting the site.
Unauthenticated users can also create and delete widgets, and read the content of widgets the site owner has removed from every sidebar.