Client-side security protects your web applications where they actually run–in your users' browsers. While traditional security tools monitor your servers, they miss the real attack surface where all your applications execute. Your website loads hundreds of third-party scripts for analytics, marketing tools, payment processors, and support widgets. If just one of these gets compromised, attackers can steal credit cards, session tokens, or personal data without you or your users knowing. Client-side security gives you visibility and protection where your apps actually operate.
Client-side attacks typically occur when a malicious actor compromises a third-party service your website uses.
Traditional security tools are designed for server infrastructure and can't see what's executing in users' browsers.
Server-side security protects your infrastructure, while client-side security protects where your applications actually execute in users' browsers.
Client-side security is a critical subset of AppSec that focuses on protecting applications where they actually execute--in users' browsers.