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TalkingTom, i have been the same problem on my site, removed the referer cod from panel/core.php

Delete this

function validate_referer()
{
    if ($_SERVER['REQUEST_METHOD'] !== 'POST') return;
    if (@!empty($_SERVER['HTTP_REFERER'])) {
        $ref = parse_url(@$_SERVER['HTTP_REFERER']);
        if ($_SERVER['HTTP_HOST'] === $ref['host']) return;
    }
    die('Invalid request');
}

if ($rights) {
    validate_referer();
}