TMZ reports:
Kylie Jenner’s cosmetics site has a shaky foundation, because it’s been inadvertently exposing very personal customer information.
Here’s the problem. When someone tried to log into the site, it would send them to an existing customer’s account, revealing names, email addresses, personal addresses, order history, etc. Every time a customer refreshed the site, it would send them to another customer’s account.
Read more on TMZ.