Klarna for WooCommerce <= 4.13.3 — Missing Authorization to Unauthenticated Sensitive Information Disclosure via 'order-pay' Endpoint

Am I affected?

• Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Klarna for WooCommerce.
• No admin access? Run a passive check of your site. It reads public files only.
• No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

1. Update to version 4.13.4, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch Klarna for WooCommerce to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Kuba.

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.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

• Advisorywordfence.com

Related CVEs

Timeline

1. Oct 15, 2026

   CVE published

   Severity high, CVSS 7.5

2. Nov 13, 2026

   Record last updated