CVE-2006-5131 in JAF CMS
Summary
by MITRE
module/shout/jafshout.php (aka the shoutbox) in ph03y3nk just another flat file (JAF) CMS 4.0 RC1 allows remote attackers to execute arbitrary code within sections bounded by "<?php" and "?>", possibly due to a static code injection vulnerability involving admin/data_inc.php.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/23/2026
The vulnerability described in CVE-2006-5131 represents a critical remote code execution flaw within the ph03y3nk just another flat file JAF CMS version 4.0 RC1. This vulnerability specifically targets the module/shout/jafshout.php component, commonly known as the shoutbox functionality, which serves as a user interaction feature within the content management system. The flaw arises from inadequate input validation and sanitization mechanisms that fail to properly process user-supplied data before incorporating it into executable code sections.
The technical exploitation of this vulnerability occurs through static code injection techniques that leverage the presence of PHP delimiters <?php and ?> within the application's code structure. When malicious input is processed by the shoutbox module, it gets directly embedded into the admin/data_inc.php file without proper sanitization, creating a scenario where attacker-controlled code can be executed within the context of the web server. This type of vulnerability falls under CWE-94, which specifically addresses "Improper Control of Generation of Code ('Code Injection')" and aligns with the broader category of code injection vulnerabilities that have been consistently ranked among the top security risks in the OWASP Top Ten.
The operational impact of this vulnerability is severe and far-reaching, as it provides remote attackers with complete control over the affected system. Successful exploitation allows malicious actors to execute arbitrary commands, potentially leading to full system compromise, data theft, or server takeover. The vulnerability affects the administrative functionality of the CMS, making it particularly dangerous as it could enable attackers to modify or delete critical system files, manipulate user data, or establish persistent backdoors. This type of attack vector is particularly concerning because it does not require authentication, making it accessible to any remote user with knowledge of the vulnerable application's structure.
From an ATT&CK framework perspective, this vulnerability maps to multiple techniques including T1059.007 for command and script injection, and T1505.003 for server-side injection. The attack chain typically begins with reconnaissance to identify the vulnerable CMS version, followed by crafting malicious payloads that exploit the code injection mechanism. The vulnerability demonstrates poor input validation practices and highlights the importance of proper sanitization of user inputs before they are processed and executed within the application's code context. Organizations should implement immediate mitigations including patching the CMS to the latest stable version, implementing proper input validation, and restricting access to administrative functions through network segmentation and authentication controls.
The root cause of this vulnerability stems from inadequate security measures during the development phase of the JAF CMS, where proper sanitization of user inputs was not implemented for dynamic code generation. This represents a classic example of how insufficient security controls during software development can lead to critical vulnerabilities that affect the entire system. The vulnerability also underscores the importance of regular security assessments and code reviews to identify potential injection points before they can be exploited by malicious actors. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts targeting similar vulnerabilities in their web applications.