CVE-2016-9026 in CMS
Summary
by MITRE • 12/31/2020
Exponent CMS before 2.6.0 has improper input validation in fileController.php.
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Analysis
by VulDB Data Team • 08/14/2026
The vulnerability exists within Exponent CMS versions prior to 2.6.0 where the fileController.php component fails to properly validate user inputs, creating a potential attack vector for malicious actors. This weakness allows attackers to manipulate file operations through crafted input parameters that are not adequately sanitized or validated before processing. The improper input validation creates an environment where arbitrary file operations could be executed, potentially leading to unauthorized access, data manipulation, or system compromise.
The technical flaw stems from insufficient sanitization of input parameters within the fileController.php script, which handles various file-related operations including uploads, downloads, and modifications. When user-supplied data is directly processed without proper validation mechanisms, it enables attackers to inject malicious payloads that can bypass intended security controls. This vulnerability aligns with CWE-20, which describes improper input validation as a fundamental weakness in software development practices. The lack of proper sanitization creates opportunities for attackers to exploit the application through techniques such as path traversal, file inclusion, or injection attacks.
The operational impact of this vulnerability extends beyond simple data corruption or unauthorized access. Attackers could potentially execute arbitrary code on the affected system, leading to complete compromise of the CMS environment. Depending on the system configuration and privileges associated with the CMS, this weakness could enable privilege escalation, data exfiltration, or the installation of persistent backdoors. The vulnerability affects not only individual user accounts but also compromises the overall security posture of the organization's web infrastructure, particularly when multiple websites or applications rely on the same vulnerable CMS instance.
Mitigation strategies should focus on immediate patching to version 2.6.0 or later where proper input validation has been implemented. Organizations should also implement additional defensive measures including input sanitization at multiple layers, regular security audits of file handling components, and monitoring for suspicious file operations. The remediation process must include comprehensive testing to ensure that all input parameters are properly validated before processing. Security controls should be aligned with industry standards such as those recommended by the OWASP Top Ten and NIST cybersecurity frameworks to prevent similar vulnerabilities in future development cycles.
Implementation of proper input validation techniques including parameterized queries, whitelist-based input filtering, and secure file handling practices will significantly reduce the attack surface. Organizations should also consider deploying web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability. Regular security training for developers regarding secure coding practices and input validation methodologies can help prevent similar issues in other components of the application stack. The remediation process should include thorough penetration testing and code review activities specifically focused on file handling operations to ensure comprehensive protection against related attack vectors.