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Plugin security / WooCommerce Square

WooCommerce Square vulnerability: is your WooCommerce store affected?

WooCommerce Square has 2 serious security holes rated 7 or higher out of 10 that someone can use with no login or with only a customer account. The newest was published on 9 January 2026. Every one is fixed: update to 5.1.2 or newer.

Short answer: your store is affected if it runs WooCommerce Square older than 5.1.2. Update to 5.1.2 or newer, on a copy of the store first if you can.

In our check of 3,600 live UK and US WooCommerce stores (31 October 2026 to 1 November 2026), 8 were running a version of WooCommerce Square with a serious hole that already had a fix. How we checked.

The security holes

Newest first. Each one is published in a public security database and fixed in the version shown.

  1. Missing permission check

    An action that should need permission could be done without it.

    Score 7.5 (high)no login neededAffected: 4.2.0 up to, not including, 5.1.2Fixed in 5.1.2Published 9 January 2026CVE-2025-13457

    Advisory: The WooCommerce Square plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 5.1.1 via the get_token_by_id function due to missing validation on a user...

  2. Missing permission check

    An action that should need permission could be done without it.

    Score 8.1 (high)needs only a customer accountAffected: older than 3.8.2Fixed in 3.8.2Published 19 June 2023CVE-2023-35876

    Advisory: Authorization Bypass Through User-Controlled Key vulnerability in WooCommerce WooCommerce Square.This issue affects WooCommerce Square: from n/a through 3.8.1.

How to check your version

  1. Log in to WordPress and open Plugins > Installed Plugins.
  2. Find WooCommerce Square. The version number is under its name. If it is lower than 5.1.2, your store is affected.
  3. No login to hand? Open https://yourstore.com/wp-content/plugins/woocommerce-square/readme.txt in a browser, with your own address in place of yourstore.com, and read the Stable tag line. Some hosts block this file; then use step 1.

How to fix it

  1. Make a backup, or better, a staging copy of the store (most hosts have a one-click staging button).
  2. On the copy, update WooCommerce Square to 5.1.2 or newer: Dashboard > Updates, or Update now on the Plugins page.
  3. If no update shows, it may be a paid version whose licence has run out: download the new version from the seller's site and upload it.
  4. Place a test order on the copy: add to cart, check out, pay with a test method. Check the pages that use WooCommerce Square.
  5. If everything works, make the same update on the live store and place one more test order.
  6. If you no longer use WooCommerce Square, delete it instead of leaving it deactivated.

Not sure, or no time?

Get a free check of your store: we look at its public pages for plugins with known holes, and reply within one working day. Or we fix it for you: we update your store on a copy, place a test order, and only then change the live store, for a fixed £99 / $119.

Free store check Fix it for me on a copy

Questions

Which WooCommerce Square version fixes it?
Version 5.1.2 or newer fixes all 2 issues on this page.
How do I know if my store is affected?
Your store is affected if it runs WooCommerce Square older than 5.1.2. In WordPress, open Plugins and read the version under WooCommerce Square. Without logging in, open yourstore.com/wp-content/plugins/woocommerce-square/readme.txt and read the Stable tag line.
I don't use WooCommerce Square any more. Is a deactivated copy safe?
Deactivating it lowers the risk but leaves the old code on your server. If you don't use it, delete it; if you do, update it.
Can someone fix it for me?
Yes. We update the store on a copy first, place a test order, and only then make the same change on the live store, for a fixed price.

Vulnerability data: WPVulnerability (wpvulnerability.net, CC0), which links each entry to its CVE or advisory. Store numbers: Tadrik's own checks of public pages, aggregates only. Page updated 3 November 2026.