itsourcecode Event Management System Cross-Site Scripting Vulnerability in Navbar.php

A cross-site scripting (XSS) vulnerability has been identified in the itsourcecode Event Management System version 1.0. The issue resides in the admin/navbar.php file, where the 'page' URL parameter is manipulated, allowing the injection of arbitrary JavaScript. This unsanitized input is reflected in the output, enabling remote attackers to execute scripts in the context of the user's browser session. The vulnerability requires no authentication and can be exploited by tricking users into clicking on a malicious link.

Impact

Exploitation of this vulnerability allows for cross-site scripting, where injected scripts are executed in the context of the user's session, potentially leading to session hijacking, unauthorized actions, data theft, or malware distribution.

Reproduction

To reproduce this vulnerability, send a request to the admin/navbar.php page with a crafted 'page' parameter that includes JavaScript code, such as a script tag with an alert command. This can be done by manually entering the URL or using a tool that allows for parameter manipulation. Once the request is sent, the injected script will execute in the browser.

Remediation

To address this vulnerability, implement input validation to reject special characters and adopt an allow-list approach. Output encoding should be applied using functions like htmlspecialchars() or htmlentities(). Additionally, consider using security headers such as Content-Security-Policy and X-XSS-Protection. Regular security testing can also help identify and mitigate such vulnerabilities.