The Klarna for WooCommerce plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.13.3 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to access any order's secret orderkey and full billing and shipping PII — including first name, last name, email address, phone number, street address, postcode, city, region, and country — emitted inline as the klarnapaymentsparams JavaScript variable, enabling full store-wide order enumeration. Because WooCommerce order IDs are sequential integers and no orderkey or authenticated session is required, every order in the store can be trivially enumerated with sequential GET requests to the order-pay endpoint.

Insertion of Sensitive Information Into Debugging Code vulnerability in Klarna Klarna Order Management for WooCommerce allows Retrieve Embedded Sensitive Data. This issue affects Klarna Order Management for WooCommerce: from n/a through 1.9.8.

The Klarna Checkout for WooCommerce WordPress plugin before 2.13.5 exposes an unauthenticated WooCommerce Ajax endpoint that allows an attacker to flood the log files with data at the maximum size allowed for a POST parameter per request. This can result in rapid consumption of disk space, potentially filling the entire disk.

Missing Authorization vulnerability in Klarna Klarna Payments for WooCommerce.This issue affects Klarna Payments for WooCommerce: from n/a through 3.2.4.