Front-End Fire 125: The RSC Vulnerabilities Keep Coming
Dec 15, 2025
Dive into the latest security vulnerabilities cropping up in React Server Components. Discover how Anthropic is giving back to the open-source community with their MCP donation. Get a sneak peek into Google's CSS developments set for 2025, including exciting new features and customizations. Plus, hear about Disney's bold move to allow user-generated content featuring beloved characters. And don’t miss whimsical discussions on twinkly Christmas lights and innovative ways to organize cables under desks!
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Patch React Quickly After RSC CVEs
- Upgrade React patch versions promptly when CVEs appear to avoid RSC-related server-function vulnerabilities.
- Run npm install and update package-lock.json so hosts and platforms receive the fix immediately.
RSC Vulnerabilities Are Server-Side Risks
- RSC parsing flaws affect servers that support RSCs even if you don't use server functions.
- App-router-based frameworks (like Next.js App Router) are the main exposure vector, not every React site.
Be Selective With MCP Tools
- Consider MCP for public, reusable tool integrations but weigh token and context costs versus direct API calls.
- Use targeted, small tool sets in MCP to avoid hallucination and unpredictable tool sequencing.