php - JS/jQuery security -

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as beginner, i'm wondering if i'm doing secure. example, finished working on code checks how many times (cross-domain) iframe has been clicked. , when clicked, inserting row mysql (log) table based on ajax request(with jquery) wraps id of iframe $_post:

$.ajax({          url: 'execute.php',         data: {action: 'some-id'},         type: 'post'     });

however i'm wondering: because javascript executed client-side, possible user send fake data through ajax request 'execute.php' page?

is possible user send fake data through ajax request 'execute.php' page?

yes.


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