This Imperva whitepaper highlights the growing risk of client-side attacks—like Magecart and formjacking—enabled by third-party scripts and a lack of visibility into code executing in users’ browsers. These threats exploit blind spots outside the scope of traditional server-side defenses. Imperva advocates for a layered approach to client-side protection including script monitoring, risk scoring, AI-driven analysis, and enforcement through Content Security Policies (CSPs). The solution should support PCI DSS 4.0 compliance, offer dynamic integrity verification, and enable zero-trust enforcement of scripts to mitigate data breaches, reduce attack surfaces, and ensure regulatory compliance.

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