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Key points and tools you can ware about:
Power Pages Web Application Firewall (WAF): Power Pages includes a Web Application Firewall feature that can be enabled to automatically block common script injection attempts in Web API calls. It applies default rules that detect and reject payloads containing script tags or suspicious HTML content. Enabling WAF is highly recommended as an extra layer of protection in production environments. Configure here. Also, you can check this one.
Input Validation and Sanitization: Always validate and sanitize user inputs both client-side and server-side. Use server-side validation via Dataverse business rules, plugins, or Power Automate flows to check for malicious content before saving data. On the client side, avoid inserting user input directly into the DOM using innerHTML. Instead, use safe methods like textContent or proper encoding.
Content Security Policy (CSP): Power Pages supports configuring CSP headers that restrict which scripts can run on your pages, helping mitigate XSS risks by limiting allowed script sources. Let's check here.
No Specific Built-in Libraries for XSS Sanitization: Power Pages does not provide a built-in JavaScript library specifically for XSS sanitization. You can integrate popular open-source libraries like DOMPurify in your custom scripts if you need advanced client-side sanitization.
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