Klarna for WooCommerce Plugin up to 4.13.3 on WordPress Order-Pay Endpoint improper authorization

Summaryinfo

A vulnerability was found in Klarna for WooCommerce Plugin up to 4.13.3. It has been classified as problematic. The affected element is an unknown function of the component Order-Pay Endpoint. The manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-110590. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Klarna for WooCommerce Plugin up to 4.13.3 and classified as problematic. This issue affects an unknown code block of the component Order-Pay Endpoint. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality. The summary by CVE is:

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.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-110590 since 10/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/16/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• Klarna for WooCommerce Plugin

Version

• 4.13.0
• 4.13.1
• 4.13.2
• 4.13.3

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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