The problem affects nearly every website using osCommerce 2.2 - even with the group level login access contribution. A test for the vulnerability can be done by using the following URL example
http://www.domaintotest.com/admin/orders.php/login.php change "domaintotest.com to your domain . Make sure you're logged off admin before entering the url. If you can access the site, hackers can also access all customer details including orders, peform database queries, upload php files to the images folder, send mass emails, etc without ever logging in. If using the group level login contribution test by using
http://www.domaintotest.com/admin/orders.php/login_admin.php.
As a developer, I can provide the required fix. Send me a private note if you need this fixed ASAP. Note: Priority is provided to sites storing credit card details.
Hackers are scouring the net for osCommerce websites including osCommerce showroom link that contain sites with this vulnerability which was discovered a couple of days ago.
James Berry