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Cross-site Scripting occurrences in Coremail Xt
jsp/upload.jsp in Coremail XT 5.0 allows XSS via an uploaded personal signature, as demonstrated by a .jpg.html filename in the signImgFile parameter. (2020-11-27, CVE-2020-29133)
Cross-site scripting (XSS) vulnerability in intervalCheck.jsp in Coremail XT 3.0 allows remote attackers to inject arbitrary web script or HTML via the sid parameter. (2018-08-10, CVE-2018-14503)
register.jsp in Coremail XT3.0 allows stored XSS, as demonstrated by the third form field to a URI under register/, a different vulnerability than CVE-2015-6942. (2018-04-07, CVE-2018-9330)
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>