CVE-2020-10461 in PHPKB Standard Multi-Language
Summary
by MITRE
The way comments in article.php (vulnerable function in include/functions-article.php) are handled in Chadha PHPKB Standard Multi-Language 9 allows attackers to execute Stored (Blind) XSS (injecting arbitrary web script or HTML) in admin/manage-comments.php, via the GET parameter cmt.
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Analysis
by VulDB Data Team • 05/11/2025
The vulnerability identified as CVE-2020-10461 resides within Chadha PHPKB Standard Multi-Language version 9, specifically in the handling of comments within the article.php script. This flaw represents a critical security weakness that enables attackers to perform stored cross-site scripting attacks through manipulation of the comment system. The vulnerability is particularly concerning because it affects the administrative interface of the content management system, where the injected malicious code can persist and execute whenever administrators view the compromised comments section.
The technical implementation of this vulnerability occurs through the vulnerable function located in include/functions-article.php, which processes comments submitted through the GET parameter named cmt. When users submit comments containing malicious JavaScript code, the system fails to properly sanitize or escape the input before storing it in the database. This stored data is then later retrieved and displayed in the admin/manage-comments.php page without adequate output encoding, creating an ideal environment for cross-site scripting exploitation. The vulnerability is classified as blind XSS because the malicious script executes in the context of the administrator's browser session, potentially granting attackers elevated privileges and access to sensitive administrative functions.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the ability to hijack administrator sessions, steal sensitive data, modify content, or even gain complete control over the compromised system. The stored nature of this attack means that once the malicious payload is injected, it will persist and execute every time the affected page is accessed by an administrator, making it particularly dangerous for long-term compromise. This vulnerability directly aligns with CWE-79 which identifies cross-site scripting flaws, and maps to ATT&CK technique T1059.001 for command and scripting interpreter, as well as T1566 for credential access through social engineering techniques.
Mitigation strategies for CVE-2020-10461 should prioritize immediate implementation of input validation and output encoding measures. All user-supplied data must be properly sanitized using whitelisting approaches or robust HTML escaping mechanisms before being stored or displayed. The system should implement Content Security Policy headers to limit script execution capabilities, while also ensuring that administrative interfaces enforce strict access controls and session management. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other input handling functions, and the affected PHPKB version should be updated to a patched release. Additionally, monitoring systems should be implemented to detect unusual comment patterns that might indicate attempted exploitation, and administrators should be trained to recognize and respond to potential XSS attack indicators in their management interfaces.