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Why do most examples of CSRF use roundabout ways of executing an API call instead of just using pure Javascript?

Çağlar Arlı      -    51 Views

Why do most examples of CSRF use roundabout ways of executing an API call instead of just using pure Javascript?

When I see examples of CSRF attacks, it is almost always explained with someone entering some external API url in an <img> tag, e.g. <img src="bank.com/transfer?amount=10000?recipient=badguy">. Or it involves a form which when submitted executes a POST request to bank.com.

My question is why not just include the API call in a <script> tag? For example,

<html>
    ...
    <script>
        fetch("bank.com/transfer?amount=10000?recipient=badguy", method: "POST");
    </script>
</html>

Wouldn't this have the same effect, or perhaps even greater effect since the user wouldn't have to manually submit a form?