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Lab 385 — SprintForge — Prototype Pollution to RCE via React Flight Protocol

hackadvisor

Task: Next.js 15.2 agile project management app using React Server Actions via Flight Protocol with unsafe deep merge on settings payload. Solution: Prototype pollution via __proto__.shell in multipart form field triggers RCE through notification dispatch system, leaking FLAG from environment variables.

$ ls tags/ techniques/
honeypot_flag_identificationenvironment_variable_exfiltrationprototype_pollution_via_deep_mergereact_flight_protocol_exploitationshell_command_execution_via_polluted_property

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