CVE-2026-103899
EU VAT Assistant for WooCommerce <= 2.1.30.260413 - Unauthenticated Stored Cross-Site Scripting via 'vat_number' Parameter
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
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 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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- daigo75 EU VAT Assistant for WooCommerce
through 2.1.30.260413
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
- browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/views/admin/order-vat-info-box.php#L173
- browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/lib/classes/order/order.php#L56
- browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/plugin-main.php#L901
- browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/plugin-main.php#L1655
- browser/woocommerce-eu-vat-assistant/tags/2.1.30.260413/src/lib/classes/integration/vat_number_validation/validators/vat_number_validator.php#L132