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You can also console.log those credentials as a PoC, and then show that the console.log could trivially be replaced by a fetch().

Kind of like a lot of exploit PoCs just "pop a calc" (AKA open the Calculator app), not because opening the calculator is valuable to an attacker, but because if you can open calculator, you can do anything.

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The problem there though, is that with PoCs like this, as an attacker you want to have a ping back to your system so that you know the attack has been successful (in this case they probably expected/hoped someone at Cursor to install the package, that's the usual objective in a dependency confusion attack). But what they could have done, is send a less sensitive thing like just the current working directory or current effective user, instead of the whole environment.

What actually changes though in your scenario? Potential bad actor gets RCE on your dev machines, it doesn't really matter what they sent home, you're rotating keys and doing your due diligence either way.

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