To prevent cross-site scripting (XSS) and other code injection attacks, Content Security Policy (CSP) can be used by defining rules for what content is allowed from safe sources. By configuring web servers to return the Content-Security-Policy HTTP header with specific directives, such as `connect-src`, malicious requests like the one that led to the Newegg breach could have been blocked, preventing the capture of sensitive payment data. Implementing CSP can also help in detecting and responding to security incidents by sending reports to tools like Sentry, which can provide insights into potential vulnerabilities and alert administrators to suspicious activity.