✍️ Description

GET parameter ?plugin= is vulnerable to reflected cross site scripting. Line 17 of pluginconfig.php sends unvalidated data to a web browser, which can result in the browser executing malicious code. In this case the data is sent at printf() in pluginconfig.php at line 17.

🕵️‍♂️ Proof of Concept

VULNERABLE CODE

#gets unvalidated user input as "plugin"
$pluginSettings['plugin'] = $_GET['plugin'];

if (!isset($skipJSsettings))
{
?>
<script type="text/javascript">
var pluginSettings = new Array();
<?
foreach ($pluginSettings as $key => $value) {
    printf("    pluginSettings['%s'] = \"%s\";\n", $key, $value); #print it to user response
}
?>
</script>

💥 Impact

The attacker can:

Perform any action within the application that the user can perform. View any information that the user is able to view. Modify any information that the user is able to modify. Initiate interactions with other application users, including malicious attacks, that will appear to originate from the initial victim user.