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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Motivation is a key part, so those attacks are more theoretical than practically dangerous, however there is a class of attacks that's based on the fact that your browser can make arbitrary network connections, so unprivileged javascript can be used for some scans of your local network - for example, your router's internally accessible admin page or some vulnerability in a printer accessible in local network, as the attacker might guess commonly used models, the internal IP addresses they use by default, etc. For example, you might take a look at https://beefproject.com/