CVE-2026-103899
7.2, highDaigo75 EU VAT Assistant for WooCommerce Cross-Site Scripting Vulnerability
- CVSS
- 7.2, high high CVSS v3.1
- EPSS, next 30 days
- n/a
- Exploitation
- No public evidence
- Published
- 17 Oct 2026yesterday
Description
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.
Details
- Vendor
- Daigo75
- Product
- EU VAT Assistant for WooCommerce
- Weakness
- CWE-79 (opens in a new tab)
- Status
- Received
- Updated
- 17 Oct 2026
- Assigner
- security@wordfence.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References 7
Other references 7
- plugins.trac.wordpress.org /browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/lib/classes/integration/admin/orders_integration.php#L238 (opens in a new tab)
- 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 (opens in a new tab)
- plugins.trac.wordpress.org /browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/lib/classes/order/order.php#L56 (opens in a new tab)
- plugins.trac.wordpress.org /browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/plugin-main.php#L1655 (opens in a new tab)
- plugins.trac.wordpress.org /browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/plugin-main.php#L901 (opens in a new tab)
- plugins.trac.wordpress.org /browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/views/admin/order-vat-info-box.php#L173 (opens in a new tab)
- wordfence.com /threat-intel/vulnerabilities/id/e2cd7c07-e119-4064-a7a9-08c81409f90a?source=cve (opens in a new tab)
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Beyond this page
Is CVE-2026-103899 in your network?
This page tells you how dangerous CVE-2026-103899 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-103899 comes with the devices to patch.
Learn more about EXYS7600 OCELOT -
EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
Learn more about EXYS7950 KONDRA
Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 18 Oct 2026, not the live upstream state.