The plugin does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).
1. Go to Settings ยป Eventify. 2. Under โCategory Slug For Events Saved As Blog Postsโ add payload: โ"><โ" and Update Category Slug to get the XSS trigger.