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Cross-site Scripting occurrences in Express Accounts Accounting

In NCH Express Accounts Accounting v7.02, persistent cross site scripting (XSS) exists in Invoices/Sales Orders/Items/Customers/Quotes input field. An authenticated unprivileged user can add/modify the Invoices/Sales Orders/Items/Customers/Quotes fields parameter to inject arbitrary JavaScript. (2019-10-17, CVE-2019-16330)

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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