CVE-2008-3184 in vBulletin
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in vBulletin 3.6.10 PL2 and earlier, and 3.7.2 and earlier 3.7.x versions, allow remote attackers to inject arbitrary web script or HTML via (1) the PATH_INFO (PHP_SELF) or (2) the do parameter, as demonstrated by requests to upload/admincp/faq.php. NOTE: this issue can be leveraged to execute arbitrary PHP code.
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Analysis
by VulDB Data Team • 11/10/2025
The vulnerability described in CVE-2008-3184 represents a critical cross-site scripting vulnerability affecting vBulletin forums version 3.6.10 PL2 and earlier, as well as 3.7.2 and earlier 3.7.x releases. This flaw resides in the application's handling of user-supplied input within the PATH_INFO (PHP_SELF) parameter and the do parameter, creating multiple attack vectors for remote code execution. The vulnerability specifically manifests when processing requests to upload/admincp/faq.php, where attackers can manipulate these parameters to inject malicious scripts that execute in the context of other users' browsers. The impact extends beyond simple XSS as the vulnerability can be leveraged to execute arbitrary PHP code, making it particularly dangerous for forum administrators and users who have elevated privileges.
The technical exploitation of this vulnerability stems from insufficient input validation and output sanitization within the vBulletin application framework. When the application processes the PATH_INFO or do parameters without proper sanitization, it fails to properly escape or filter user-controllable data before incorporating it into web responses. This creates a condition where malicious payloads can be injected into the application's output, which are then executed by victim browsers. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates how inadequate input filtering can lead to complete system compromise. Attackers can craft malicious URLs containing PHP code within the vulnerable parameters, which when executed by the web server, can result in unauthorized access to the system.
The operational impact of CVE-2008-3184 is severe and multifaceted for affected organizations. Remote attackers can leverage this vulnerability to inject malicious scripts that can steal session cookies, redirect users to phishing sites, or execute unauthorized commands on the affected server. The ability to execute arbitrary PHP code through this vulnerability means attackers can potentially gain full control over the compromised forum, install backdoors, modify forum content, or even use the compromised server for further attacks against other systems. The vulnerability affects not just individual users but can compromise entire forum installations, making it particularly dangerous for websites that host sensitive user data or serve as platforms for business communications. Organizations may face regulatory compliance issues, data breaches, and reputational damage when such vulnerabilities are exploited in the wild.
Mitigation strategies for CVE-2008-3184 should focus on immediate patching and input validation improvements. Organizations must upgrade to patched versions of vBulletin as soon as possible, as the vulnerability was addressed in later releases. Additionally, implementing proper input validation and output encoding for all user-supplied data can prevent similar issues from occurring. Security measures should include configuring web application firewalls to detect and block malicious payloads, implementing strict access controls for administrative functions, and conducting regular security audits of web applications. The vulnerability demonstrates the importance of following secure coding practices and adhering to the principle of least privilege when designing web applications. Organizations should also implement monitoring systems to detect suspicious activity related to file uploads and administrative functions, as these areas are particularly vulnerable to exploitation. This vulnerability serves as a reminder of the critical importance of maintaining up-to-date software and implementing comprehensive security controls to protect against known vulnerabilities that can be exploited for remote code execution.