Magecart attacks inject malicious JavaScript into payment pages to silently skim card data as users type. They happen entirely in the browser, which means WAFs and server-side tools have no visibility into them. cside monitors every script on every payment page in real time, alerts on unauthorised changes before users are exposed, and can block malicious scripts from executing. PCI DSS 4.0.1 requirements 6.4.3 and 11.6.1 were introduced specifically to mandate these controls.
How do client-side attacks actually happen?
Compromising a third-party service your website relies on is one common way attackers get in.
Why can't traditional security tools detect client-side threats?
Firewalls, WAFs, and vulnerability scanners are traditional security tools used to protect your server, but they cannot see what's happening in your users' browsers.
What's the difference between client-side security and server-side security?
Server-side security protects your infrastructure, while client-side security focuses on where your application actually runs, inside your users' browsers.
What's the difference between client-side security and application security?
Client-side security is a critical subset of AppSec that focuses on protecting applications where they actually execute--in users' browsers.