I have notified cs-cart via the helpdesk this is a heads-up for other store owners as potential to exploit.
Where a vendor adds a item to cart in one shopfront and doesn’t complete transaction then navigates to another shopfront the cart shows on both shopfronts = branding confusion
… then if customer adds a item on shopfront B to cart when that item isn’t sold on shopfront A then return to shopfront A you now have 2 ‘items’ @ price of Shopfront A item (even if Shopfront B item costs more)
And if item A sold by vendor A and item B sold by vendor B then vendor A shipping details no longer shown in checkout on shopfront A