CVE-2006-5919 in KnowledgeBuilder
Summary
by MITRE
PHP remote file inclusion vulnerability in admin/e_data/visEdit_control.class.php in ActiveCampaign KnowledgeBuilder 2.2 allows remote attackers to execute arbitrary PHP code via a URL in the visEdit_root parameter, a different vector than CVE-2003-1131.
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Analysis
by VulDB Data Team • 04/27/2026
The vulnerability identified as CVE-2006-5919 represents a critical remote file inclusion flaw within the ActiveCampaign KnowledgeBuilder 2.2 web application. This security weakness resides in the admin/e_data/visEdit_control.class.php file where improper input validation allows attackers to inject malicious URLs through the visEdit_root parameter. The vulnerability operates as a remote code execution vector that enables unauthorized individuals to execute arbitrary PHP code on the target system, potentially leading to complete system compromise and unauthorized access to sensitive data. The flaw specifically affects the application's handling of user-supplied input without adequate sanitization or validation mechanisms, creating an exploitable condition that can be leveraged by remote attackers.
The technical nature of this vulnerability aligns with CWE-98, which describes improper restriction of operations within a shared code library, and represents a classic example of a remote file inclusion attack pattern. This vulnerability differs from CVE-2003-1131 in its specific attack vector and target location within the application's codebase, indicating a persistent issue in the software's input handling mechanisms. The exploitation process involves crafting a malicious URL and injecting it through the visEdit_root parameter, which then gets processed by the vulnerable PHP application. The absence of proper input validation allows the application to treat the injected URL as a legitimate file path, leading to the execution of malicious code from remote servers.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to establish persistent access to the compromised system. Successful exploitation could result in data breaches, system infiltration, and potential lateral movement within network environments where the vulnerable application resides. Attackers may leverage this vulnerability to upload backdoors, modify existing files, or gain administrative privileges within the application. The vulnerability's remote nature means that attackers do not require physical access to the system, making it particularly dangerous for web applications that are publicly accessible. Organizations utilizing ActiveCampaign KnowledgeBuilder 2.2 would face significant risk exposure, as the vulnerability could be exploited by automated scanning tools or determined attackers without requiring specialized knowledge of the specific application architecture.
Mitigation strategies for CVE-2006-5919 should focus on immediate patching of the vulnerable application to address the input validation flaw in the visEdit_control.class.php file. Organizations should implement proper parameter validation and sanitization measures to prevent malicious URLs from being processed by the application. The implementation of input validation controls such as allowlists or strict parameter filtering can effectively prevent exploitation attempts. Additionally, network segmentation and firewall rules should be configured to limit access to vulnerable application components, reducing the attack surface. Security monitoring should be enhanced to detect unusual file inclusion patterns or suspicious parameter values in web application logs. The remediation process should include comprehensive code review to identify and address similar vulnerabilities in other parts of the application, ensuring that input validation mechanisms are consistently applied throughout the codebase. Organizations should also consider implementing web application firewalls to provide additional protection against similar remote file inclusion attacks, while maintaining regular vulnerability assessments to identify potential weaknesses in their web application infrastructure.