CVE-2006-5520 in PHP Classifieds
Summary
by MITRE
PHP remote file inclusion vulnerability in functions.php in DeltaScripts PHP Classifieds 7.1 allows remote attackers to execute arbitrary PHP code via a URL in the set_path parameter.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5520 represents a critical remote file inclusion flaw within the DeltaScripts PHP Classifieds version 7.1 software. This issue resides in the functions.php file and specifically affects the set_path parameter handling, creating a pathway for malicious actors to execute arbitrary PHP code on the targeted system. The vulnerability stems from inadequate input validation and sanitization practices that fail to properly filter user-supplied data before incorporating it into file inclusion operations.
This remote code execution vulnerability operates through a classic path traversal and file inclusion attack vector where an attacker can manipulate the set_path parameter to reference external URLs containing malicious PHP code. The flaw essentially allows an attacker to inject and execute arbitrary code by leveraging the application's trust in user input during file inclusion processes. The vulnerability is classified under CWE-88, which deals with Command Line Injection, and specifically aligns with CWE-94, representing Arbitrary Code Execution, making it a severe security risk that can lead to complete system compromise.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with potential access to sensitive system resources, database credentials, and application files. An attacker who successfully exploits this vulnerability can gain unauthorized access to the web server hosting the classifieds application, potentially leading to data breaches, service disruption, and further lateral movement within the network infrastructure. The vulnerability also enables attackers to establish persistent backdoors, modify application behavior, and escalate privileges within the system environment.
Organizations should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching of the affected DeltaScripts PHP Classifieds version 7.1. The mitigation strategy must include input validation and sanitization measures that prevent malicious URLs from being processed through the set_path parameter. Additionally, implementing proper file inclusion practices such as using whitelisting mechanisms and avoiding dynamic file inclusion based on user input can significantly reduce the attack surface. Network segmentation and intrusion detection systems should be deployed to monitor for suspicious file inclusion patterns, while application firewalls can help filter malicious requests targeting this specific vulnerability. This vulnerability also aligns with ATT&CK technique T1190, which covers Exploit Public-Facing Application, emphasizing the importance of proper input validation and the principle of least privilege in application design.