The React2Shell Story
On November 30th 2025, I reported a critical remote code execution vulnerability ("React2Shell") to Meta. On December 3rd, Meta released a fix and public advisory (CVE-2025-55182), urging developers to immediately update.
Funnily enough, I didn't set out to find a vulnerability in React. I just wanted to understand a protocol so I could be better at hacking modern web applications. But instead, I fell down a rabbit hole to a critical vulnerability that affected millions of websites.