Error 403 when uploading cropped image with Croppie to Laravel 8 Controller

Question

I'm currently working on a Laravel 8 project in which I need to create cards with text and cropped images using the Croppie plugin. Everything works perfectly locally. However, once in production, when I send the cropped image to my controller, the server firewall interprets it most of the time as an attack and the server returns a 403 error.
Here is the information the firewall tells me :

ID : 340029 Sévérité : CRITICALLabel : - info : Atomicorp.com WAF Rules: Attack Blocked - command in REQUEST_URI or Argument message : Access denied with code 403 (phase 2). Pattern match "(?:;|/|\| )(?:\b(?:cat|ls|perl|uname|pwd|cp|tclsh8?|cpp|f(?:etch|tp)|python|chown|rm|ping|rsync|rdiff-backup|scp|(?:w|ftp)get|curl|lin

In my blade file, I have a hidden input to which I send the cropped image from the croppie javascript and which allows me to retrieve the image in my Laravel controller. Here is my code:

<form action="{{ route('card.store') }}"method="POST" novalidate autocomplete="off" enctype="multipart/form-data">
    @csrf
    <label for="title">Title</label>
    <input id="title" name="title" type="text">
    <input id="imgCrop" name="img_crop" type="hidden" />
    <button id="submitBtn" type="submit">Save</button>
</form>

$('.upload-result').on('click', function(ev) {
    $uploadCrop.croppie('result', {
        type: 'canvas',
        size: {width: 1920, height: 1280},
        format: 'jpeg',
        quality: 0.7
    }).then(function(resp) {
        $('#imgCrop').val(resp);
        $('#imgPreview').removeClass('d-none');
        $('#imgPreview').attr("src", $('#imgCrop').val());
    });
});

I spent many hours searching for a solution to this problem, including on the forums, but without success. Does anyone know of a solution to resolve this problem please?