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CIS Advisories

A Vulnerability in React Server Component (RSC) Could Allow for Remote Code Execution

2025-12-05 · Read original ↗

ATT&CK techniques detected

3 predictions
T1078.001Default Accounts
90%
"tests : perform periodic external penetration tests based on program requirements, no less than annually. external penetration testing must include enterprise and environmental reconnaissance to detect exploitable information. penetration testing requires specialized skills and e…"
T1190Exploit Public-Facing Application
49%
"patched 15. x release - next. js 16. x – all versions prior to the patched 16. x release - any frameworks or tools that bundle react server components prior to the patched react versions. risk : government : businesses : home users : technical summary : a vulnerability has been d…"
T1190Exploit Public-Facing Application
40%
"a vulnerability in react server component ( rsc ) could allow for remote code execution a vulnerability in react server component ( rsc ) could allow for remote code execution ms - isac advisory number : 2025 - 111date ( s ) issued : 12 / 05 / 2025overview : a vulnerability in th…"

Summary

A vulnerability in the React Server Components (RSC) implementation has been discovered that could allow for remote code execution. Specifically, it could allow for unauthenticated remote code execution on affected servers. The issue stems from unsafe deserialization of RSC “Flight” protocol payloads, enabling an attacker to send a crafted request that triggers execution of code on the server. This is now being called, “React2Shell” by security researchers.