How to Secure Drupal Commerce Payments with CSP for PCI DSS Compliance

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Securing Drupal Commerce with CSP for PCI DSS Compliance
Source: Securing Drupal Commerce: The Role of a Content Security Policy in Payment Compliance by Mohammad Fayoumi (August 18, 2025), Vardot.

Mohammad Fayoumi of Vardot explains how implementing a Content Security Policy (CSP) is vital for achieving PCI DSS 4.0 compliance in Drupal Commerce sites. Since payment pages are prime targets for script injection attacks, CSP headers restrict which resources (JavaScript, CSS, images, APIs) can load, reducing risks like XSS and unauthorized script execution. PCI DSS requires site owners to authorize all scripts, ensure their integrity using nonces or hashes, and prevent unapproved code from running.

For Drupal, the Security Kit module simplifies CSP implementation, allowing admins to configure directives, add nonces automatically, and monitor violations. Fayoumi highlights key directives for PCI DSS: script-src (authorizing trusted scripts), frame-ancestors (anti-clickjacking), object-src (blocking legacy plugins), and connect-src (controlling data transfer). He recommends stricter CSP rules on checkout pages, whitelisting only trusted payment providers, and leveraging violation reporting for monitoring. Properly implemented, CSP enhances both compliance and customer trust in Drupal Commerce.

Reference: Securing Drupal Commerce: The Role of a Content Security Policy in Payment Compliance by Mohammad Fayoumi, Vardot (18 August 2025)

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