Is CVE-2026-100316 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100316 being exploited in the wild.

How severe is CVE-2026-100316?

High severity, with a CVSS score of 7.2, published 17 October 2026.

Which products and versions are affected?

WooCommerce European VAT Compliance Assistant up to and including 1.36.10.

Is there a fix for CVE-2026-100316?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-100316 attacked?

It is attacked over the network.

Am I affected by CVE-2026-100316?

Check whether you run WooCommerce European VAT Compliance Assistant at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-100316: European VAT Compliance Assistant for WooCommerce stored XSS via CF-IPCountry header

CVE-2026-100316 · Severity: high · CVSS 7.2 · Published 2026-10-17

The European VAT Compliance Assistant plugin for WooCommerce stores order information during checkout. An attacker can inject malicious code into HTTP headers that the plugin saves directly into order records without proper sanitization. When any user views an affected order page, this code executes in their browser, potentially stealing sensitive data or compromising their account.

Vendors: WooCommerce.

Quick answers

Is CVE-2026-100316 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100316 being exploited in the wild.
How severe is CVE-2026-100316?: High severity, with a CVSS score of 7.2, published 17 October 2026.
Which products and versions are affected?: WooCommerce European VAT Compliance Assistant up to and including 1.36.10.
Is there a fix for CVE-2026-100316?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-100316 attacked?: It is attacked over the network.
Am I affected by CVE-2026-100316?: Check whether you run WooCommerce European VAT Compliance Assistant at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The plugin fails to sanitize the CF-IPCountry HTTP header value before storing it in WordPress post-meta during guest checkout, resulting in stored XSS. An unauthenticated attacker can craft a request with a malicious CF-IPCountry header containing JavaScript, which persists in the order metadata and executes when administrators or other users access the order details page. No authentication or user interaction on the attacker's part is required to inject the payload.

Affected products

WooCommerce European VAT Compliance Assistant up to and including 1.36.10

Timeline

2026-10-17: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.