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Cross-site Scripting occurrences in Wp Customer Reviews
The WP Customer Reviews WordPress plugin before 3.5.6 did not sanitise some of its settings, allowing high privilege users such as administrators to set XSS payloads in them which will then be triggered in pages where reviews are enabled (2021-05-24, CVE-2021-24296)
Unvalidated input and lack of output encoding in the WP Customer Reviews WordPress plugin, versions before 3.4.3, lead to multiple Stored Cross-Site Scripting vulnerabilities allowing remote attackers to inject arbitrary JavaScript code or HTML. (2021-03-18, CVE-2021-24135)
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>