Kustom Checkout for WooCommerce

Kustom Checkout for WooCommerce has 2 disclosed vulnerabilities in the WordSec catalog, reported between 2020 and 2025; all 2 are fixed as of September 2026. Their average CVSS score is 5.3, and the most serious one scores 5.4 out of 10.

The most common weakness is Missing Authorization, behind 1 of the records (50%). Other recurring categories include Uncontrolled Resource Consumption.

Every one of the 2 issues recorded for Kustom Checkout for WooCommerce has a vendor fix available, so running the current release closes all known holes.

Kustom Checkout for WooCommerce is installed on roughly 10,000 WordPress sites, so each unpatched flaw has a wide blast radius. The current release is tested up to WordPress 7.1.

Strategic Overview

Avg CVSSMedium
5.3/ 10
Patch Coverage100%
Open

0

Fixed

2

Get automatic notifications for all Kustom Checkout for WooCommerce vulnerabilities before they are exploited.

Highest severity on recordCVSS 5.4

Klarna Checkout for WooCommerce <= 2.0.9 - Arbitrary Plugin Installation, Activation and Deactivation

Read the full analysis

Vulnerability Records

2 records
Kustom Checkout for WooCommerce banner
Latestv2.20.11

Kustom Checkout for WooCommerce

Kustom Checkout

Author

Kustom Checkout

3.5(15)
70/100
Last Updated
2026-08-25 (19d ago)
Active Installs
10,000+
Downloads
1,519,583
Requires WP
5.0+
Requires PHP
7.4+
Tested up to
WP 7.1
Created
2017-12-12 (9y ago)

The leading checkout in the Nordics, built for higher conversion and returning shoppers. Easy to integrate, supports Klarna and all popular payment methods, and includes built-in shipping. This all-in-one solution makes checkout effortless for you and your customers. Get access to all popular payment methods, including Klarna, and shipping integrations in a single setup. It’s easy to integrate, requires minimal maintenance, and is fully customizable to your business needs. Kustom, formerly known as Klarna Checkout, became an independent company in 2024 to provide merchants with an even better checkout solution. As a standalone solution, Kustom can quickly adapt to merchants’ needs and expand its range of payment methods, markets, and features – all to maximize conversion and create a seamless checkout experience. Kustom has 24,000 connected merchants with sales in over 170 countries. Pay Now (direct payments) Customers who want to pay in full at checkout can do it quickly and securely with a credit/debit card. Friction-free direct purchases while maximising the value for your business thanks to guaranteed payments. If they have a Kustom account they can save their details and enjoy one-click purchases from then on. Pay later (invoice) Try it first, pay it later. Delayed payments for customers who like low friction purchases and to pay after delivery. Slice it (installments) Installment, revolving and other flexible financing plans let customers pay when they can and when they want. How to Get Started Sign up for Kustom. Install the plugin on your site. Get your store approved by Kustom, and start selling.

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