Reflected Cross-Site Scripting (XSS) in Xibo CMS v4.1.2 from Xibo Signage, due to a lack of proper validation of user input. To exploit the vulnerability, the attacker must create a template in the 'Templates' section, then add an element that has the 'Configuration Name' field, such as the 'Clock' widget. Next, modify the 'Configuration Name' field in the left-hand section.