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Cross-site Scripting occurrences in Razorcms
HTML injection exists in razorCMS 3.4.8 via the /#/page keywords parameter. (2018-12-31, CVE-2018-19905)
Stored XSS exists in razorCMS 3.4.8 via the /#/page description parameter. (2018-12-31, CVE-2018-19906)
razorCMS 3.4.7 allows HTML injection via the description of the homepage within the settings component. (2018-09-12, CVE-2018-16726)
razorCMS 3.4.7 allows Stored XSS via the keywords of the homepage within the settings component. (2018-09-12, CVE-2018-16727)
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>