CVE-2016-2242 in Exponent
Summary
by MITRE
Exponent CMS 2.x before 2.3.7 Patch 3 allows remote attackers to execute arbitrary code via the sc parameter to install/index.php.
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Analysis
by VulDB Data Team • 05/14/2026
The vulnerability identified as CVE-2016-2242 affects Exponent CMS version 2.x prior to 2.3.7 Patch 3, representing a critical remote code execution flaw that could enable attackers to gain unauthorized control over affected systems. This vulnerability specifically resides in the installation script of the content management system where the sc parameter in install/index.php fails to properly validate user input, creating an avenue for malicious code injection. The flaw demonstrates characteristics consistent with CWE-94, which describes the execution of arbitrary code due to insufficient input validation or sanitization in software applications. The vulnerability's impact extends beyond simple code execution as it provides attackers with the capability to manipulate the entire CMS environment, potentially leading to complete system compromise.
The technical exploitation of this vulnerability occurs through the manipulation of the sc parameter during the installation process, where attackers can inject malicious code that gets executed within the context of the web server. This type of vulnerability falls under the ATT&CK technique T1059.007, which covers the execution of code through command-line interfaces, and T1505.003, which involves the use of third-party software or libraries to execute malicious code. The vulnerability's nature suggests that the application fails to properly sanitize or escape user-supplied input before processing it, creating a path for attackers to inject and execute arbitrary PHP code. This flaw is particularly dangerous because it exists during the installation phase when the system may have elevated privileges and the attacker can potentially influence the installation process to deploy malicious payloads.
The operational impact of this vulnerability is severe and multifaceted, as it allows attackers to execute arbitrary code remotely without requiring authentication or prior access to the system. Successful exploitation could result in complete system compromise, data exfiltration, or the deployment of backdoors and other persistent malicious tools. Organizations using affected versions of Exponent CMS face significant risk of unauthorized access, data breaches, and potential lateral movement within their networks. The vulnerability affects not only the CMS itself but also any systems that rely on it for content management, potentially exposing sensitive information and critical business data. Attackers could leverage this vulnerability to establish persistent access, modify website content, or use the compromised system as a launchpad for further attacks against other network resources.
Mitigation strategies for CVE-2016-2242 should prioritize immediate patching of affected systems to version 2.3.7 Patch 3 or later, which addresses the input validation flaw in the installation script. Organizations should also implement network segmentation to limit access to installation scripts and reduce the attack surface. Security measures including web application firewalls, input validation controls, and regular security assessments should be deployed to prevent exploitation attempts. Additionally, system administrators should monitor for unusual access patterns and unauthorized modifications to CMS installations. The vulnerability highlights the importance of proper input sanitization and the need for comprehensive security testing during the development lifecycle, particularly in applications that handle user input during critical operations such as installation processes. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates and maintain updated inventories of all CMS installations across their infrastructure.