CVE-2020-10396 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/add-language.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-2020-10396 resides within the Chadha PHPKB Standard Multi-Language version 9, specifically affecting the admin/header.php component. This security flaw manifests as a reflected cross-site scripting vulnerability that occurs when processing Uniform Resource Identifiers within the administrative interface. 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. Attackers can exploit this weakness by crafting malicious URIs that contain specially formatted payloads, which then get reflected back to users through the vulnerable page.
The technical exploitation of this vulnerability occurs through the manipulation of URI parameters within the admin/add-language.php endpoint. When a malicious user constructs a URI containing a question mark followed by arbitrary script payload, the application fails to adequately sanitize this input before rendering it in the browser context. This allows attackers to inject malicious JavaScript code or HTML elements that execute in the context of other users' browsers who visit the affected page. The reflected nature of this XSS vulnerability means that the malicious payload is not stored on the server but is instead reflected off the web server in response to a user's request, making it particularly dangerous for administrative interfaces where privileged users might be tricked into executing the malicious code.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with potential access to administrative functions and sensitive data within the PHPKB system. Given that the vulnerability affects the admin header component, successful exploitation could allow attackers to escalate privileges, access confidential information, modify content, or potentially gain full control over the administrative interface. The reflected nature of the vulnerability means that attacks can be delivered through phishing emails, malicious links in chat applications, or other social engineering techniques that encourage users to click on crafted URIs. This makes the attack surface particularly wide and difficult to control, as the vulnerability can be exploited through various communication channels without requiring persistent access to the target system.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. The most effective immediate fix involves sanitizing all user-supplied input parameters before they are processed or rendered in web responses, particularly within administrative interfaces. Implementing proper Content Security Policy headers can provide additional protection against script execution, while ensuring that the application properly encodes output data to prevent script injection. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a classic example of reflected XSS that can be addressed through proper input validation and output encoding practices. Organizations should also consider implementing web application firewalls to detect and block malicious URI patterns, while maintaining regular security updates and vulnerability assessments to prevent similar issues in other components of the system. The ATT&CK framework categorizes this type of vulnerability under T1212, which addresses exploitation for credential access through web application vulnerabilities, emphasizing the need for comprehensive application security controls to prevent such attacks from compromising administrative systems.