The most common client-side attacks include credit card skimming (like Magecart attacks). But theft of session tokens through client-side scripts, malicious redirects, or general sensitive high-value data exfiltration are on the rise. These attacks have affected major companies, like British Airways and Ticketmaster with over 380,000 documented attacks in 2025 alone so far. Client-side attacks are often highly dynamic and targeted to prevent detection. Flying below the radar by only injecting malicious payloads under certain circumstances. They only fire at specific times, request locations, or user agents, making them nearly impossible to detect with traditional security tools.
Client-side security protects your website visitors from malicious JavaScript attacks that happen directly in their browsers.
The cost of hiring a fraudulent actor extends far beyond wasted salary expenses and in some cases has even bankrupted the victims.
Tech companies and government contractors are prime targets because they handle valuable intellectual property, source code, infrastructure credentials and sensitive data that foreign adversaries want to access.
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