---
id: CVE-2026-103899
title: >-
  EU VAT Assistant for WooCommerce <= 2.1.30.260413 - Unauthenticated Stored
  Cross-Site Scripting via 'vat_number' Parameter
summary: >-
  The EU VAT Assistant for WooCommerce plugin for WordPress is vulnerable to
  Stored Cross-Site Scripting via the 'vat_number' parameter in all versions up
  to, and including, 2.1.30.260413 due to insufficient input sanitization and
  output e…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: daigo75
product: EU VAT Assistant for WooCommerce
affected:
  - eu_vat_assistant_for_woocommerce <= 2.1.30.260413
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-18T11:06:57.510378Z'
published: '2026-10-17'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T11:12:33.948Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103899'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/e2cd7c07-e119-4064-a7a9-08c81409f90a?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/lib/classes/integration/admin/orders_integration.php#L238
  - url: >-
      https://plugins.trac.wordpress.org/browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/views/admin/order-vat-info-box.php#L173
  - url: >-
      https://plugins.trac.wordpress.org/browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/lib/classes/order/order.php#L56
  - url: >-
      https://plugins.trac.wordpress.org/browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/plugin-main.php#L901
  - url: >-
      https://plugins.trac.wordpress.org/browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/plugin-main.php#L1655
  - url: >-
      https://plugins.trac.wordpress.org/browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/lib/classes/integration/vat_number_validation/validators/vat_number_validator.php#L132
tags:
  - cve.org
ingestedAt: '2026-10-17T03:58:44.707Z'
---

## Overview

The EU VAT Assistant for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'vat_number' parameter in all versions up to, and including, 2.1.30.260413 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The stored payload executes in the administrator's browser context when reviewing an order via WooCommerce → Orders → Edit Order, enabling privilege escalation up to and including full site takeover via rogue administrator account creation.

## Affected

- `eu_vat_assistant_for_woocommerce <= 2.1.30.260413`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.