As more and more services get digital these days, security has become a significant aspect of every application. Especially when it comes to third-party code, it is tough to guarantee safety. But in general, XSS and Code Injection is a big problem these days. Content Security Policy provides another layer of security that helps to detect and protect different attacks. In this talk, I will introduce this concept and its main features, as well as show real-world examples and integrations for WordPress.