Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-103899— EU VAT Assistant for WooCommerce <= 2.1.30.260413 - Unauthenticated Stored Cross-Site Scripting via 'vat_number' Parameter

Quick assessment

Affected
daigo75 EU VAT Assistant for WooCommerce
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 "EU VAT Assistant for WooCommerce" 插件在所有 2.1.30.260413 及更早版本中，因输入清理和输出转义不足，存在存储型跨站脚本（Stored XSS）漏洞，攻击向量为 参数。该漏洞允许未认证的攻击者在页面中注入任意 Web 脚本，当用户访问被注入的页面时，脚本即被执行。存储的恶意载荷在管理员通过 WooCommerce → 订单 → 编辑订单 审核订单时，于管理员浏览器上下文中执行，从而导致权限提升，最高可达创建恶意管理员账户并完全接管整个网站。

CVSS 7.2 · High EPSS 0.24% · P14
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-103899

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
EU VAT Assistant for WooCommerce <= 2.1.30.260413 - Unauthenticated Stored Cross-Site Scripting via 'vat_number' Parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
daigo75 EU VAT Assistant for WooCommerce 0 ~ 2.1.30.260413 -

II. Public POCs for CVE-2026-103899

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-103899

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-103899 (1)

Vendor Pages for CVE-2026-103899 (3)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-103899

No comments yet

Leave a comment