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Cross-site Scripting occurrences in Hero Maps Premium

The Hero Maps Premium plugin 2.2.1 and prior for WordPress is prone to unauthenticated XSS via the views/dashboard/index.php p parameter because it fails to sufficiently sanitize user-supplied input. An attacker may leverage this issue to inject HTML or arbitrary JavaScript within the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based tokens or to launch other attacks. (2020-02-26, CVE-2019-19134)

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>

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