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I ran your exploit-rce-v4.js with and without the patched react-server-dom-webpack, and both of them executed the RCE.

So I don't think this mechanism is exactly correct, can you demo it with an actual nextjs project, instead of your mock server?

I'v updated the code, try it now with server-realistic.js:

1. npm start 2. npm run exploit

I'm trying that, nextjs is a little different because it uses a Proxy object before it passes through, which blocks the rce.

I'm debugging it currently, maybe I'm not on the right path after all.