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Cross-site Scripting occurrences in Razor
Razor v0.8.0 was discovered to contain a cross-site scripting (XSS) vulnerability via the function uploadchannel(). (2022-08-30, CVE-2022-36747)
An issue was discovered in Western Bridge Cobub Razor 0.7.2. Authentication is not required for /index.php?/manage/channel/modifychannel. For example, with a crafted channel name, stored XSS is triggered during a later /index.php?/manage/channel request by an admin. (2018-03-07, CVE-2018-7746)
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>