---
id: "CVE-2026-110590"
kind: "vulnerability"
aliases: ["CVE-2026-110590"]
title: "Klarna for WooCommerce: unauthenticated access to all order PII and keys"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["klarna", "package", "self-hosted", "woocommerce", "wordpress"]
not_affected_if: ["fixed-version", "plugin-not-installed"]
published_at: "2026-10-16T05:17:29+00:00"
first_seen_at: "2026-10-23T21:57:12+00:00"
updated_at: "2026-10-25T03:25:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110590", "first_seen_at": "2026-10-23T21:57:12+00:00"}]
---

# Klarna for WooCommerce: unauthenticated access to all order PII and keys

The Klarna for WooCommerce WordPress plugin, up to and including 4.13.3, fails to check authorization on the order-pay page. An unauthenticated attacker can read any order's secret order_key and full billing and shipping personal data, including names, emails, phone numbers and addresses.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed version of the Klarna for WooCommerce plugin in the WordPress admin under Plugins; `4.13.3` or earlier is affected
- unknown

## Fix

- Update the Klarna for WooCommerce plugin to a version later than `4.13.3`, as published by the vendor
- unknown

## Timeline

- 2026-10-23T21:57:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-110590

## From the sources

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 order_key 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 klarna_payments_params JavaScript variable, enabling full store-wide order enumeration. Because WooCommerce order IDs are sequential integers and no order_key or authenticated session is required, every order in the store can be trivially enumerated with sequential GET requests to the order-pay endpoint.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_