CVE-2020-10417 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/manage-articles.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-2020-10417 resides within the Chadha PHPKB Standard Multi-Language version 9, specifically in the admin/header.php file where URI handling mechanisms fail to properly sanitize input parameters. This weakness creates a reflected cross-site scripting vulnerability that can be exploited by attackers who manipulate URL parameters to inject malicious scripts into the application's administrative interface. The vulnerability manifests when a user navigates to admin/manage-articles.php with a specially crafted URL containing a question mark followed by malicious payload data, allowing the application to reflect this input back to the user's browser without proper sanitization or encoding.
The technical flaw stems from insufficient input validation and output encoding practices within the PHP application's administrative components. When the application processes URI parameters in the header.php file, it fails to implement proper sanitization measures that would prevent malicious script code from being executed within the context of the victim's browser session. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is improperly handled and reflected back to users. The reflected nature of this vulnerability means that the malicious payload is not stored on the server but rather injected through a crafted URL that, when visited by an authenticated administrator, executes the malicious code in their browser context.
The operational impact of this vulnerability is significant as it provides attackers with a potential vector for privilege escalation and unauthorized administrative actions. An attacker who can convince an administrator to visit a maliciously crafted URL could potentially execute arbitrary JavaScript code within the administrator's browser session, potentially leading to session hijacking, credential theft, or unauthorized modifications to the knowledge base content. The vulnerability affects the administrative interface specifically, making it particularly dangerous as administrators typically have elevated privileges and access to sensitive data. This flaw can be leveraged as part of broader attack chains where initial access is gained through social engineering or other means, and then the reflected XSS serves as a mechanism for maintaining or escalating access to the compromised system.
Mitigation strategies should focus on implementing proper input validation and output encoding mechanisms throughout the application's codebase, particularly in the administrative components. The recommended approach includes implementing strict parameter validation that filters out potentially malicious characters and ensuring that all user-supplied input is properly encoded before being reflected back to the browser. Organizations should also consider implementing Content Security Policy (CSP) headers to limit the execution of unauthorized scripts, and regular security testing should be conducted to identify similar vulnerabilities in other parts of the application. Additionally, the vulnerability demonstrates the importance of following secure coding practices as outlined in the OWASP Top Ten and MITRE ATT&CK framework, specifically addressing the need for proper input sanitization and output encoding to prevent XSS attacks. The affected application version should be updated to a patched release that addresses this specific vulnerability, as the vendor should have implemented proper parameter handling and sanitization mechanisms to prevent reflected XSS in administrative interfaces.