Developer Turns CVSS 10.0 RCE Exploit Script into Chrome Extension Using GitHub Copilot

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A security researcher revived a dormant 50-line Python proof-of-concept, originally written in December 2025 to fingerprint CVE-2025-55182, a critical unauthenticated Remote Code Execution vulnerability in React Server Components. Using GitHub Copilot as an architectural assistant, the developer spent 48 hours rebuilding the script into a Manifest V3 Chrome extension during the MLH Finish-Up-a-Thon hackathon. The upgraded tool, named RSC Fingerprint Detector, performs both passive and active reconnaissance to detect React Flight protocol vulnerabilities without triggering backend alerts. Key architectural improvements include IndexedDB-backed persistent telemetry, Shadow DOM isolation, and cross-context IPC, replacing the original synchronous, stateless design. GitHub Copilot played a central role in navigating Chrome's Content Security Policy restrictions and MV3 lifecycle constraints that had previously stalled the project.

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