CVE-2020-10477 in PHPKB Standard Multi-Language
Summary
by MITRE
Reflected XSS in admin/manage-news.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 CVE-2020-10477 represents a reflected cross-site scripting flaw in the Chadha PHPKB Standard Multi-Language version 9 content management system. This security weakness exists within the admin/manage-news.php script where the application fails to properly sanitize user input received through the GET parameter named sort. The vulnerability allows malicious actors to execute arbitrary web scripts or HTML code in the context of a victim's browser, potentially leading to unauthorized actions or data theft. The reflected nature of this XSS attack means that the malicious script is reflected off the web server back to the victim's browser, typically through a crafted URL that includes the malicious payload.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the PHPKB application. When the sort parameter is processed without proper sanitization, any user-supplied content containing script tags or malicious JavaScript code gets directly embedded into the web page response. This occurs because the application does not employ proper HTML escaping or context-aware encoding mechanisms before rendering user-provided data. The vulnerability specifically affects the administrative interface where news management functionality is handled, making it particularly dangerous as it targets privileged users with elevated system access. According to CWE standards, this maps to CWE-79 which categorizes improper neutralization of input during web page generation, and more specifically to CWE-749 which addresses exposed dangerous method or function.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with a potential foothold for more sophisticated attacks within the compromised system. An attacker could craft malicious URLs containing payloads that steal session cookies, redirect users to phishing sites, or inject malicious content that persists in the application's database. The reflected nature of the attack means that successful exploitation requires social engineering to convince victims to click on malicious links, but once executed, the attack can compromise the administrative session and potentially lead to full system compromise. This vulnerability aligns with ATT&CK technique T1566 which covers spearphishing with a malicious attachment or link, and T1059 which covers command and scripting interpreter for executing malicious code.
Mitigation strategies for CVE-2020-10477 should focus on implementing robust input validation and output encoding mechanisms throughout the application. The most effective immediate fix involves sanitizing all user input through proper HTML escaping before rendering any content in the web interface. Developers should implement a whitelist approach for acceptable sort parameter values and ensure that all dynamic content is properly encoded for the HTML context in which it appears. Additionally, the application should implement Content Security Policy headers to limit the sources from which scripts can be loaded and executed. Organizations should also consider implementing proper access controls and monitoring for unusual administrative activity that might indicate exploitation attempts. Regular security audits and vulnerability assessments should be conducted to identify similar input validation flaws in other parts of the application, as this represents a common pattern of security weakness in web applications. The fix should also include updating the affected PHPKB version to the latest release where this vulnerability has been patched, following the principle of least privilege for administrative interfaces, and implementing proper logging and alerting mechanisms for suspicious parameter usage patterns.