This article is a part of our Vulnerability Database (back to index)
Cross-site Scripting occurrences in Emoncms
Modules/input/Views/schedule.php in Emoncms through 10.2.7 allows XSS via the node parameter. (2021-02-21, CVE-2021-26716)
OpenEnergyMonitor Project Emoncms 9.8.8 is affected by: Cross Site Scripting (XSS). The impact is: Theoretically low, but might potentially enable persistent XSS (user could embed mal. code). The component is: Javascript code execution in "Name", "Location", "Bio" and "Starting Page" fields in the "My Account" page. File: Lib/listjs/list.js, line 67. The attack vector is: unknown, victim must open profile page if persistent was possible. (2019-07-15, CVE-2019-1010008)
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>