Cross Site Scripting (XSS) vulnerability in School Fees Management System v.1.0 allows a remote attacker to execute arbitrary code via a crafted payload to the main_settings component in the phone, address, bank, acc_name, acc_number parameters, new_class and cname parameter, add_new_parent function in the name email parameters, new_term function in the tname parameter, and the edit_student function in the name parameter.