Jan 16
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In this video, I explain a critical server-side Remote Code Execution (RCE) vulnerability affecting React Server Components and frameworks like Next.js. Many tools and scanners reference CVE-2025-66478, but this CVE was later rejected as a duplicate. The actual root vulnerability is CVE-2025-55182, which impacts React 19.x when Server Components (RSC / Flight protocol) are used. What this video covers: Why CVE-2025-66478 was rejected The real vulnerability behind CVE-2025-55182 How React Server Components process serialized Flight data How unsafe deserialization can lead to server-side RCE A localhost vulnerable server demo to show how the attack flow works Which React / Next.js versions are affected Which setups are not affected Practical mitigation and upgrade guidance ⚠️ This is a server-side vulnerability, not a browser exploit. ⚠️ The demo is performed only on localhost for educational purposes. Who should watch: Bug bounty hunters Pentesters Web security engineers React / Next.js developers Anyone deploying server-side React apps Join this channel to get access to perks: https://www.youtube.com/channel/UCiiEXWVI8XDV_SbIOYVuKog/join #ReactSecurity #ReactRCE #ReactServerComponents #NextjsSecurity #NextjsVulnerability #CVE202555182 #CVE202566478 #WebSecurity #BugBounty #Pentesting #ApplicationSecurity #ServerSideSecurity #RemoteCodeExecution #CyberSecurity #Infosec #SecurityResearch #LocalhostDemo #DeserializationVulnerability