CVE-2026-3993 Details

A cross-site scripting (XSS) vulnerability has been identified in the itsourcecode Payroll Management System version 1.0. The issue resides in the manage_employee_deductions.php file, where user input through the 'id' parameter is not properly sanitized before being reflected in the page output. This flaw allows remote attackers to inject and execute arbitrary JavaScript in the context of the user's browser session. The vulnerability does not require authentication but relies on tricking a user into clicking a malicious link.

It is recommended to implement input validation to reject special characters, use an allow-list approach, and apply output encoding techniques such as htmlspecialchars() or htmlentities(). Additionally, consider adding security headers like Content-Security-Policy and X-XSS-Protection.