CVE-2020-37152 in PHP-Fusion
Summary
by MITRE • 02/05/2026
PHP-Fusion 9.03.50 panels.php is vulnerable to cross-site scripting (XSS) via the 'panel_content' POST parameter. The application fails to properly sanitize user input before rendering it in the browser, allowing attackers to inject arbitrary JavaScript. This can be exploited by submitting crafted input to the 'panel_content' field in panels.php, resulting in execution of malicious scripts in the context of the affected site.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 02/10/2026
The vulnerability identified as CVE-2020-37152 affects PHP-Fusion version 9.03.50 and resides within the panels.php component of the application. This represents a classic cross-site scripting flaw that stems from inadequate input validation and sanitization practices. The vulnerability specifically targets the 'panel_content' POST parameter, which serves as an entry point for malicious actors to inject harmful code into the application's rendering pipeline. The flaw allows attackers to bypass the application's security controls and execute arbitrary JavaScript code within the context of legitimate user sessions, potentially compromising the entire web application and its user base.
The technical exploitation of this vulnerability occurs when an attacker submits malicious content through the 'panel_content' parameter in the panels.php script. PHP-Fusion fails to implement proper output encoding or input sanitization mechanisms before processing and displaying this user-provided content. This inadequate sanitization creates a persistent XSS vector where JavaScript code becomes executable within the browser context of any user who views the compromised panel content. The vulnerability is particularly concerning because it operates at the application layer, affecting the presentation logic rather than underlying system components, and can be leveraged to perform session hijacking, defacement, or data exfiltration attacks.
The operational impact of this vulnerability extends beyond simple script execution, as it can be weaponized to establish persistent access to affected systems. Attackers can craft malicious payloads that exploit the XSS flaw to steal session cookies, redirect users to phishing sites, or inject additional malicious content that propagates throughout the application. This vulnerability aligns with CWE-79 which categorizes cross-site scripting as a critical weakness in web application security, and can be mapped to ATT&CK technique T1566.001 for initial access through malicious web content. The vulnerability affects the integrity and availability of the web application's content delivery mechanism, potentially leading to complete compromise of the user authentication system and unauthorized access to sensitive data.
Mitigation strategies for CVE-2020-37152 must focus on implementing robust input validation and output encoding mechanisms throughout the PHP-Fusion application. The immediate solution involves sanitizing all user-provided input through proper HTML entity encoding before rendering content in the browser context. Organizations should implement Content Security Policy headers to limit script execution and prevent unauthorized code injection. Additionally, the application should enforce strict input validation for the 'panel_content' parameter, rejecting or filtering out potentially malicious content patterns. Regular security audits and input validation testing should be conducted to prevent similar vulnerabilities from emerging in other application components. The patch for this vulnerability would typically involve updating PHP-Fusion to a version that properly sanitizes user input before processing, following secure coding practices that align with OWASP Top Ten recommendations for preventing XSS attacks.