XSS

React's client-side rendering model introduces XSS vulnerabilities from improperly sanitized JSX content, bypassing PHP's native sanitization. Additionally, heavy reliance on npm packages increases exposure to supply-chain threats and malicious code in third-party dependencies.

65% of SPAs encounter security issues due to exposed client-side code and resources loaded upfront. Common vulnerabilities include XSS (cross-site scripting), CSRF attacks, and data exposure. Over 50% of applications are vulnerable to attacks.