JS Sniffer

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Understanding JavaScript Sniffers​

A JavaScript sniffer is a type of malicious code that can be injected into a website to capture user input, such as passwords, credit card numbers, and other sensitive information. These scripts can be injected via Cross-Site Scripting (XSS) vulnerabilities, which occur when an application includes untrusted data in a webpage without proper validation or escaping.

Example of a Hypothetical Sniffer​

An example of a basic JavaScript sniffer might look like this:

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How It Works​

1. Event Listener: The script listens for the submit event on forms.
2. Capture Data: When a form is submitted, it captures the input data from the form.
3. Send Data: It then sends this data to a malicious server using a fetch request.