CVE-2006-4771 in ForumJBC
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in haut.php in ForumJBC 4 allows remote attackers to inject arbitrary web script or HTML via the nb_connecte parameter.
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Analysis
by VulDB Data Team • 10/26/2025
The vulnerability identified as CVE-2006-4771 represents a classic cross-site scripting flaw within the ForumJBC 4 software platform, specifically affecting the haut.php component. This security weakness enables malicious actors to execute arbitrary web scripts or HTML code within the context of authenticated users' browsers, fundamentally compromising the integrity of the web application's security model. The vulnerability manifests through the nb_connecte parameter, which serves as an entry point for attacker-controlled input that bypasses proper sanitization mechanisms.
The technical exploitation of this XSS vulnerability occurs when the application fails to properly validate or escape user-supplied input before rendering it within the web page context. In the case of ForumJBC 4, the nb_connecte parameter in haut.php does not implement adequate input filtering or output encoding, allowing attackers to inject malicious payloads that execute in the victim's browser. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws, where the application fails to properly sanitize user input before incorporating it into dynamically generated web content. The vulnerability's classification aligns with the ATT&CK technique T1059.001 which encompasses command and scripting interpreters, as attackers can leverage XSS to inject JavaScript code that can further compromise the victim's session or redirect them to malicious sites.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to phishing sites. In a forum environment, this poses significant risks since users may be authenticated and have elevated privileges within the platform. The vulnerability can be exploited through various vectors including email links, forum posts, or direct injection into URL parameters, making it particularly dangerous due to its ease of exploitation and potential for widespread impact. Attackers can craft malicious payloads that appear legitimate to users, leveraging the trust relationship between the user and the forum application to execute their malicious intent.
Mitigation strategies for CVE-2006-4771 should focus on implementing robust input validation and output encoding mechanisms throughout the application. The most effective approach involves sanitizing all user-supplied input through proper escaping techniques before rendering it within the web page context. This includes implementing proper HTML entity encoding for output, utilizing Content Security Policy headers to limit script execution, and employing input validation frameworks that reject potentially malicious content. Organizations should also consider implementing Web Application Firewalls to detect and block suspicious input patterns, while ensuring that all forum software components are regularly updated to address known vulnerabilities. The remediation process should include thorough code review of the haut.php component to ensure proper parameter handling and input validation, with additional security testing including dynamic analysis to verify the effectiveness of implemented mitigations against XSS attacks.