Zen Cart authors were recently notified of a security vulnerability affecting customer address data in Zen Cart v1.5.7-series and v1.5.8-series. They released a patch for the vulnerability and a script to clean up any malicious code in the customer address data.[https://www.zen-cart.com/showthread.php?230032-Security-patch-for-Zen-Cart-v1-5-7-series-and-v1-5-8-series]

If you are running Zen Cart 1.5.7 or 1.5.8, we strongly advise this patch be installed. If you cannot do it yourself, please contact us for assistance.