Session Hijacking via Reflected Cross-Site Scripting (XSS) in ChurchCRM EditEventAttendees.php EID Parameter

A vulnerability exists in ChurchCRM 5.13.0 that allows an attacker to execute arbitrary JavaScript in a victim's browser via Reflected Cross-Site Scripting (XSS) in the EditEventAttendees.php page. This requires Administration privileges and affects the EID parameter. The flaw allows an attacker to steal session cookies, perform actions on behalf of an authenticated user, and gain unauthorized access to the application.