CVE-2026-110590 klarnaplugin CVE debrief

Who should care

Defenders responsible for WordPress installations with the Klarna for WooCommerce plugin should assess exposure and prioritize remediation, focusing on verifying affected deployments, reviewing official advisories, and planning vendor-supported updates or mitigations. Security teams and vulnerability management teams should also review and act on this vulnerability.

Why it matters

The authorization bypass vulnerability in the Klarna for WooCommerce plugin allows unauthenticated attackers to access sensitive order information and enumerate orders.

• Enumeration of all orders in a WooCommerce store using sequential GET requests to the order-pay endpoint
• Exposure of sensitive order information, including secret order_key and full billing and shipping PII

Technical summary

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, allowing 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.

Defensive priority

Defenders should prioritize verifying exposure and remediating vulnerable versions of the Klarna for WooCommerce plugin.

Recommended defensive actions

• Verify the version of the Klarna for WooCommerce plugin and update to a fixed version if necessary.
• Restrict access to the order-pay endpoint to prevent unauthorized enumeration of orders.
• Monitor for suspicious activity related to order enumeration and PII exposure.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

Evidence from the CVE record and source references indicates an authorization bypass vulnerability in the Klarna for WooCommerce plugin, allowing unauthenticated attackers to access sensitive order information. The vulnerability is due to improper authorization verification, enabling attackers to enumerate orders and access PII. Defenders should verify exposure and remediate vulnerable versions.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.