CVE-2009-3647 in Mega File Hosting Script
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in emaullinks.php in YABSoft Mega File Hosting Script (aka MFH or MFHS) 1.2 allows remote attackers to inject arbitrary web script or HTML via the moudi parameter. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 07/06/2025
The vulnerability identified as CVE-2009-3647 represents a critical cross-site scripting flaw within the YABSoft Mega File Hosting Script version 1.2, specifically affecting the emaullinks.php component. This security weakness stems from inadequate input validation and sanitization mechanisms that fail to properly process user-supplied data. The vulnerability manifests through the moudi parameter, which serves as an entry point for malicious actors to inject arbitrary web scripts or HTML content into the targeted web application. The absence of proper sanitization allows attackers to execute malicious code within the context of other users' browsers, potentially compromising the confidentiality, integrity, and availability of the affected system.
The technical exploitation of this vulnerability follows standard XSS attack patterns where the attacker crafts malicious payloads targeting the moudi parameter in the emaullinks.php script. When the vulnerable application processes this parameter without adequate filtering or encoding, the injected scripts execute in the victim's browser context. This flaw aligns with CWE-79, which categorizes cross-site scripting vulnerabilities as weaknesses in input validation and output encoding. The attack vector operates through web browsers that interpret and execute the injected scripts, potentially leading to session hijacking, data theft, or unauthorized actions performed on behalf of authenticated users. The vulnerability's classification as a remote attack means that no local access or user interaction is required for exploitation, making it particularly dangerous in web environments.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling attackers to perform sophisticated attacks against the web application and its users. Attackers could leverage this vulnerability to steal session cookies, redirect users to malicious sites, or modify the application's behavior to serve phishing content. The attack could result in unauthorized access to user accounts, data breaches, and potential compromise of the entire hosting infrastructure. The vulnerability's presence in a file hosting script makes it particularly attractive to attackers targeting user data and potentially malicious file distribution. Organizations using this software would face reputational damage, regulatory compliance issues, and potential legal consequences from data exposure incidents. The vulnerability's persistence in the application's codebase indicates inadequate security testing and code review processes during the software development lifecycle.
Mitigation strategies for this vulnerability should encompass immediate patching of the affected application to address the input validation flaw in the emaullinks.php script. Security measures must include implementing proper input sanitization and output encoding techniques to prevent malicious data from being executed as scripts. Organizations should deploy web application firewalls to detect and block suspicious requests containing potential XSS payloads. The implementation of content security policies and proper HTTP headers can provide additional defense layers against script injection attacks. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in the application's codebase. The remediation process should follow established security frameworks such as OWASP Top Ten and NIST guidelines for web application security. Additionally, developers should adopt secure coding practices that emphasize input validation, output encoding, and proper error handling to prevent similar vulnerabilities from emerging in future releases of the software.