A Cross-Site Scripting (XSS) vulnerability was found in pkg_mgr_install.php, a
part of the pfSense software WebGUI, on version 2.4.3 and earlier.
On pkg_mgr_install.php, the value of the output parameter was not validated nor
encoded before being printed to the user, which could be used as an XSS vector.
Due to the lack of proper encoding on the affected variable susceptible to XSS,
cookie or other information from the session may be compromised.
Due to the fact that this can only be exploited via custom POST data submitted
by an authenticated user with a valid CSRF token, the impact is lower than most