CVE-2020-10467 in PHPKB Standard Multi-Language
Summary
by MITRE
Reflected XSS in admin/edit-comment.php in Chadha PHPKB Standard Multi-Language 9 allows attackers to inject arbitrary web script or HTML via the GET parameter p.
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Analysis
by VulDB Data Team • 05/11/2025
The vulnerability CVE-2020-10467 represents a reflected cross-site scripting flaw discovered in the Chadha PHPKB Standard Multi-Language version 9 content management system. This security weakness exists within the administrative interface, specifically in the admin/edit-comment.php script, making it particularly dangerous as it targets privileged users who have access to the system's administrative functions. The vulnerability arises from insufficient input validation and output sanitization mechanisms that fail to properly handle user-supplied data when processing GET parameters.
The technical implementation of this vulnerability stems from the application's failure to adequately sanitize the GET parameter p before incorporating it into the web page response. When an attacker crafts a malicious URL containing crafted script code within the p parameter and delivers it to an authenticated administrator, the script executes in the administrator's browser context. This occurs because the application reflects the malicious input directly back to the user without proper encoding or validation, creating a classic reflected XSS scenario that aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation. The vulnerability specifically affects the administrative comment editing functionality, where the p parameter is used to determine which comment to display for editing, making it a prime target for privilege escalation attacks.
The operational impact of this vulnerability is significant as it enables attackers to execute arbitrary scripts in the context of authenticated administrator sessions. This creates a severe risk of privilege escalation, where malicious actors can potentially gain full administrative control over the system. Attackers could leverage this vulnerability to steal session cookies, modify content, delete database entries, or even install backdoors. The reflected nature of the vulnerability means that the attack requires user interaction, typically through social engineering to convince administrators to click malicious links. This attack vector aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: JavaScript, and T1566.001 - Phishing: Spearphishing Attachment, as it relies on delivering malicious JavaScript through crafted web requests.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms. The primary fix involves sanitizing all user-supplied input parameters, particularly those used in dynamic content generation, by implementing proper HTML entity encoding before rendering any user-provided data. Organizations should also implement Content Security Policy headers to limit script execution and prevent unauthorized code injection. Additionally, the application should enforce strict parameter validation and reject any input that contains potentially malicious patterns. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the system. The fix should also include implementing proper access controls and session management practices to limit the impact of any successful exploitation attempts. This vulnerability highlights the critical importance of input validation in web applications and demonstrates how seemingly minor oversights in parameter handling can lead to severe security consequences.