CVE-2006-5189 in klinza professional cms
Summary
by MITRE
PHP remote file inclusion vulnerability in funzioni/lib/show_hlp.php in klinza professional cms 5.0.1 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the appl[APPL] parameter.
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Analysis
by VulDB Data Team • 04/23/2026
The vulnerability identified as CVE-2006-5189 represents a critical remote file inclusion flaw within the klinza professional cms version 5.0.1 and earlier systems. This vulnerability resides in the file funzioni/lib/show_hlp.php which processes user input through the appl[APPL] parameter without adequate validation or sanitization. The flaw enables remote attackers to inject malicious URLs that are subsequently included and executed as PHP code on the target server, creating a severe security risk that can lead to complete system compromise.
The technical nature of this vulnerability aligns with CWE-88, which describes improper neutralization of special elements used in an expression, specifically in the context of remote file inclusion attacks. The vulnerability operates through a classic insecure direct object reference pattern where user-supplied input directly influences file inclusion operations. When the appl[APPL] parameter contains a URL pointing to malicious content, the PHP application fails to validate or sanitize this input before using it in an include or require statement, allowing attackers to execute arbitrary code on the server.
From an operational impact perspective, this vulnerability provides attackers with extensive capabilities including arbitrary code execution, privilege escalation, and potential data exfiltration. The remote nature of the exploit means that attackers do not require physical access or local credentials to exploit the vulnerability. This weakness can be leveraged to establish persistent backdoors, steal sensitive information, or use the compromised system as a launch point for further attacks within the network infrastructure. The vulnerability essentially allows attackers to bypass normal access controls and gain unauthorized administrative access to the CMS system.
The attack vector for this vulnerability follows established patterns documented in the MITRE ATT&CK framework under techniques such as T1190 for exploit public-facing applications and T1059 for command and script injection. Attackers typically construct malicious URLs that point to attacker-controlled servers hosting malicious PHP payloads, which are then included and executed by the vulnerable application. The remediation approach involves implementing proper input validation and sanitization, utilizing whitelisting mechanisms for file inclusion parameters, and ensuring that all user-supplied input undergoes rigorous security checks before being processed. Organizations should also implement web application firewalls and regularly update their CMS systems to prevent exploitation of known vulnerabilities. The vulnerability underscores the critical importance of secure coding practices and proper input validation in preventing remote code execution attacks.