CVE-2026-22241

Lab Environment for CVE-2026-22241

Vulnerability Description:

• Vulnerability: Unrestricted Upload of File with Dangerous Type.
• Impact: Remote Code Execution (RCE).
• Description: This flaw allows an attacker with administrative privileges to upload a malicious PHP file (Web Shell), leading to full compromise of the web server's integrity and security.
• Target System: OpenClass Educational Infrastructure.

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1. Build the environment

sudo git clone https://github.com/CVEs-Labs/CVE-2026-22241.git

open https://www.openeclass.org/en/previous-versions/ and download openeclass-4.0.1.zip

sudo apt update && sudo apt install docker.io docker-compose -y

sudo systemctl start docker

sudo cp openeclass-4.0.1.zip CVE-2026-22241

cd CVE-2026-22241

sudo mkdir html

sudo unzip openeclass-4.0.1.zip -d ./temp_folder

sudo mv ./temp_folder/openeclass-4.0.1/* ./html/

sudo rm -rf ./temp_folder

sudo rm -rf openeclass-4.0.1.zip

sudo chown -R $USER:www-data html/

sudo chmod -R 775 html/

sudo docker-compose up -d

sudo docker exec -it eclass-web bash -c "apt-get update && apt-get install -y libpng-dev libzip-dev libicu-dev libxml2-dev libldap2-dev && docker-php-ext-configure ldap --with-libdir=lib/x86_64-linux-gnu/ && docker-php-ext-install zip gd pdo pdo_mysql intl soap ldap && apache2ctl restart"

sudo docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' eclass-web

http://ip-docker