In this technical talk, Neel Desai explores how Content Security Policy (CSP) serves as a critical defense layer against Cross-Site Scripting (XSS) attacks in Mendix applications drawing from real-world implementation experiences at Golden Earth. Attendees will learn practical CSP deployment strategies including runtime configuration, handling Atlas UI and marketplace widget compatibility, and implementing effective testing approaches. The session will cover common pitfalls, security trade-offs, and implementation patterns that help developers build robust security boundaries without sacrificing functionality.