CVE-2020-10474 in PHPKB Standard Multi-Language
Summary
by MITRE
Reflected XSS in admin/manage-comments.php in Chadha PHPKB Standard Multi-Language 9 allows attackers to inject arbitrary web script or HTML via the GET parameter sort.
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Analysis
by VulDB Data Team • 05/12/2025
The vulnerability identified as CVE-2020-10474 represents a critical reflected cross-site scripting flaw within the Chadha PHPKB Standard Multi-Language version 9 content management system. This security weakness specifically affects the admin/manage-comments.php administrative interface component, making it a prime target for malicious actors seeking to compromise the system's integrity and user sessions. The vulnerability stems from inadequate input validation and output sanitization mechanisms that fail to properly escape or filter user-supplied data before incorporating it into web responses. The attack vector is particularly concerning as it leverages the GET parameter named 'sort' which is commonly used for sorting comment listings in administrative interfaces, making it a routine interaction point for administrators.
The technical implementation of this vulnerability follows the classic reflected XSS pattern where malicious input is first received through a web request parameter, then reflected back to the user without proper sanitization, and finally executed in the victim's browser context. When an administrator accesses the manage-comments.php page with a specially crafted sort parameter containing malicious JavaScript code, the application fails to validate or escape the input before rendering it in the HTML response. This allows attackers to inject arbitrary web scripts or HTML content that executes within the administrator's browser session, potentially leading to session hijacking, credential theft, or further system compromise. The vulnerability directly maps to CWE-79 which classifies improper neutralization of input during web page generation as a primary weakness in web application security.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with a potential foothold for more sophisticated attacks within the administrative environment. An attacker who successfully exploits this vulnerability could manipulate comment listings to redirect administrators to malicious sites, steal session cookies, or even inject persistent backdoors into the system. The attack requires minimal sophistication as it only necessitates crafting a malicious URL with the appropriate payload and convincing an administrator to click on it, making it particularly dangerous in environments where administrators frequently interact with external links. This vulnerability particularly affects organizations relying on PHPKB for knowledge base management, where administrative access is often restricted to trusted personnel but remains a critical attack surface.
Effective mitigation strategies for CVE-2020-10474 must focus on implementing robust input validation and output encoding mechanisms throughout the application stack. The primary remediation involves sanitizing all user-supplied input parameters, particularly those used for sorting operations, by implementing proper HTML entity encoding before rendering any dynamic content. Organizations should implement Content Security Policy headers to limit the execution of inline scripts and establish proper input validation routines that reject or sanitize potentially malicious payloads. Additionally, the application should employ proper parameter validation to ensure that sorting parameters only accept predefined, safe values rather than arbitrary user input. This vulnerability also aligns with ATT&CK technique T1213 which describes access to system or network resources through web application vulnerabilities, emphasizing the need for comprehensive web application security testing and regular security assessments to identify similar reflected XSS vulnerabilities across the entire application surface.