CVE-2018-25114: Oscommerce Online Merchant

Critical severity, CVSS 9.3. EPSS: 4.2% chance of exploitation in the next 30 days.

A remote code execution vulnerability exists within osCommerce Online Merchant version 2.3.4.1 due to insecure default configuration and missing authentication in the installer workflow. By default, the /install/ directory remains accessible after installation. An unauthenticated attacker can invoke install_4.php, submit crafted POST data, and inject arbitrary PHP code into the configure.php file. When the application later includes this file, the injected payload is executed, resulting in full server-side compromise.

Affected products

Published 2025-07-23. Last modified 2026-06-17.