This brief highlights the rising threat of client-side web application attacks, often stemming from compromised third-party scripts. These attacks can steal customer data, cause compliance violations, and result in financial loss or brand damage. Traditional server-side defenses fall short against these browser-based threats. The c/side solution addresses this gap by proxying third-party script traffic, analyzing it with AI and threat intelligence, and blocking malicious activity in real time. With PCI DSS 4.0 tightening client-side requirements, solutions like c/side are becoming essential for protecting customer data, ensuring compliance, and preserving trust.

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