pfSense: pfSense-SA-24_04.webgui: XSS vulnerability in vendor files used by the WebGUI

A potential Cross-Site Scripting (XSS) vulnerability was identified in
jquery-treegrid unit testing files.

The pfSense Plus and pfSense CE software GUI includes the jquery-treegrid
library for use in the disks widget on the Dashboard. The jquery-treegrid
library includes unit testing files for a bundled unit testing library (QUnit).
That unit testing library has multiple issues, including a known XSS
vulnerability.

This problem is present on pfSense Plus version 23.09.1, pfSense CE version
2.7.2, and earlier versions of both.

Due to the lack of proper encoding on the affected parameters susceptible to
XSS, arbitrary JavaScript could be executed in the user's browser. The user's
session cookie or other information from the session may be compromised.

These static vendor library files are accessible to users who are not logged
into the GUI. Only access to the web server at a network level is required.