CVE-2020-10451 in PHPKB Standard Multi-Language
Summary
by MITRE
The way URIs are handled in admin/header.php in Chadha PHPKB Standard Multi-Language 9 allows Reflected XSS (injecting arbitrary web script or HTML) in admin/report-user.php by adding a question mark (?) followed by the payload.
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Analysis
by VulDB Data Team • 05/11/2025
The vulnerability identified as CVE-2020-10451 represents a critical reflected cross-site scripting weakness within the Chadha PHPKB Standard Multi-Language version 9 content management system. This security flaw specifically manifests in the administrative header component where URI handling processes fail to properly sanitize user input parameters. The vulnerability occurs when the application processes URL parameters without adequate validation or encoding mechanisms, creating an exploitable condition that allows malicious actors to inject arbitrary JavaScript code or HTML content directly into the administrative interface.
The technical exploitation of this vulnerability requires minimal effort from an attacker who can simply append a question mark character followed by malicious payload data to the URI path. This payload is then reflected back to the victim user's browser through the admin/report-user.php endpoint, where the unfiltered input is rendered without proper sanitization. The reflected nature of this XSS vulnerability means that the malicious script executes in the context of the victim's browser session, potentially allowing attackers to hijack user sessions, steal sensitive information, or perform unauthorized actions within the administrative interface. This vulnerability directly maps to CWE-79 which defines Cross-Site Scripting as a common web application security flaw where untrusted data is embedded into web pages viewed by other users.
The operational impact of this vulnerability extends beyond simple script injection as it provides attackers with elevated privileges within the administrative environment. Since the flaw exists in the admin/header.php component, successful exploitation could enable attackers to access sensitive administrative functions, modify user accounts, manipulate content, or potentially escalate their privileges to full system compromise. The reflected XSS nature makes this vulnerability particularly dangerous because it requires no persistent storage of malicious code and can be delivered through social engineering tactics such as phishing emails or compromised links. This vulnerability aligns with ATT&CK technique T1059.007 which describes the use of script interpreters for execution, specifically targeting the execution of malicious scripts within web applications.
Mitigation strategies for CVE-2020-10451 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's URI handling processes. The most effective immediate solution involves sanitizing all user-supplied input parameters before they are processed or displayed, particularly within the administrative interface components. Organizations should implement proper HTML escaping and context-appropriate encoding for all dynamic content rendered in the admin/report-user.php page. Additionally, implementing Content Security Policy (CSP) headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. Regular security updates and patches should be applied to the PHPKB platform, while network monitoring and intrusion detection systems should be configured to identify suspicious URI patterns that may indicate exploitation attempts. The vulnerability also underscores the importance of implementing proper web application firewalls and input validation controls at multiple layers of the application architecture to prevent similar issues from occurring in other components of the system.