Sanitize Client-Side: Why Server-Side HTML Sanitization is Doomed to Fail
SMRTR summary
Cross-site scripting (XSS) prevention through server-side HTML sanitization has limitations due to parsing inconsistencies across environments. Client-side sanitization is recommended as a best practice to ensure consistent parsing and reduce bypass risks. Developers should carefully restrict allowed HTML features and consider using robust libraries like DOMPurify for scenarios requiring some HTML input.
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