Data skimming attacks steal payment card details or credentials from the browser before they reach the server, making server-side tools useless for detection. cside detects active skimmers by monitoring what scripts actually do at runtime, including reading form field values and sending data to unauthorised domains. It hashes all scripts on payment pages and alerts when a hash changes, catching injected skimmers before they reach users at scale. VikingCloud has validated that this approach meets PCI DSS 4.0.1 requirements 6.4.3 and 11.6.1, the industry's formal controls for payment page skimming prevention.
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.