URGENT: Fix This React Exploit Immediately

A critical security vulnerability (CVE with CVSS score 10/10) was discovered in React versions 19.0 to 19.2.0 that allows remote code execution through React server components. Attackers could send malicious HTTP requests to execute unauthorized code, access environment variables, modify data, or take control of servers. The React team quickly released version 19.2.1 to patch the vulnerability. Developers using React, Next.js, React Router, Remix, or other affected frameworks should immediately upgrade to the patched version.