Read private customer data reclaiming carts in Klaviyo Magento

Impact

A researcher identified an endpoint in a thirth party module Klaviyo Magento 2 which allows to read private customer data from stores. It works by reclaiming any guest-cart as your own and reading the private data for the orders in the Magento API.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

Original source description

References

• Patch github.com/klaviyo/magento2-klaviyo/pull/107
• Source reference gist.github.com/JeroenBoersma/f5864a45e3df63b198a57abdff366df2
• Security advisory github.com/FriendsOfPHP/security-advisories/blob/master/klaviyo/magento2-extension/2021-05-25-1.yaml
• Source reference github.com/klaviyo/magento2-klaviyo