Kylie Jenner's Lip Kit Website Glitch ... Personal Customer Info Exposed

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.

Customers of Kylie Cosmetics were understandably upset, and complained to her people. We're told they had no idea it was happening, and just made a quick, temporary fix.

A lot of people could have had their info compromised, because Monday was restock day for Kylie's Lip Kit -- which sold out immediately with over a million kits bought.