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Cross-site Scripting occurrences in Wp Responsive Menu
The WP Responsive Menu WordPress plugin before 3.1.7.1 does not have capability and CSRF checks in the wpr_live_update AJAX action, as well as do not sanitise and escape some of the data submitted. As a result, any authenticated, such as subscriber could update the plugin's settings and perform Cross-Site Scripting attacks against all visitor and users on the frontend (2022-02-28, CVE-2021-24971)
Why Cross-site Scripting can be dangerous
Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.
The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:
https://server.com/confirmation?message=Transaction+Complete
what results in:
<span>Confirmation: Transaction Complete</span>
In that case the message can be modified to become a valid Javascript code, e.g.:
https://server.com/confirmation?message=<script>dangerous javascript code here</script>
and it will be executed locally by the user's browser with full access to the user's personal application/browser data:
<span>Confirmation: <script>dangerous javascript code here</script></span>