osCommerce 2.3.4.1 Installer Unauthenticated Configuration File Injection PHP Code Execution

published 2025-07-23 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2018-21601

cvss: 9.3; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 4.6%; EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits: 1; Metasploit, plus a Nuclei check

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.

Timeline

2018-04-30 First public exploit (Metasploit exploit/multi/http/oscommerce_installer_unauth_code_exec)
2025-07-23 Published

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: total
Assessed: 15 mo ago (2025-07-23)

Exploit prediction

4.56% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Metasploit exploit/multi/http/oscommerce_installer_unauth_code_exec osCommerce Installer Unauthenticated Code Execution metasploit exploit, excellent rank, 2018-04-30
Nuclei template osCommerce 2.3.4.1 - Remote Code Execution nuclei detection template
exploit-db.com https://www.exploit-db.com/exploits/44374 referenced PoC, tagged "exploit" by a source, unverified
raw.githubusercontent.com https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/multi/http/oscommerce_installer_unauth_code_exec.rb referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	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
CNA	4.0	9.3	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

osCommerce Online Merchant

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-94 Improper Control of Generation of Code

References

exploit-db.com /exploits/44374
exploit
raw.githubusercontent.com /rapid7/metasploit-framework/master/modules/exploits/multi/http/oscommerce_installer_unauth_code_exec.rb
exploit
oscommerce.com /
product
vulncheck.com /advisories/oscommerce-installer-unauth-config-file-injection-php-code-execution
third-party-advisory

Sources

CVE List CVE-2018-25114
NVD CVE-2018-25114

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary