---
title: "CVE-2026-100147: FunnelKit – Funnel Builder for WooCommerce Checkout - Stored XSS"
description: "FunnelKit – Funnel Builder for WooCommerce Checkout <= 3.16.0.5 contains a stored XSS caused by insufficient sanitization and escaping of 'shipping_first_name' parameter, letting unauthenticated attackers execute scripts on user pages."
url: https://panop.io/threat-heartbeat/CVE-2026-100147/
---

# CVE-2026-100147 FunnelKit – Funnel Builder for WooCommerce Checkout - Stored XSS

FunnelKit – Funnel Builder for WooCommerce Checkout <= 3.16.0.5 contains a stored XSS caused by insufficient sanitization and escaping of 'shipping\_first\_name' parameter, letting unauthenticated attackers execute scripts on user pages.

CVSS base score 7.2 /10

High

CISA KEV

Exploited in the wild

Public exploit

None known

Authentication

Not required

EPSS

0.30% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100147)

## Details

Type

Stored XSS

Impact

Stored XSS

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Published

10 October 2026

Updated

15 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to the latest version beyond 3.16.0.5.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-100147](https://nvd.nist.gov/vuln/detail/CVE-2026-100147)
- [https://patchstack.com/database/wordpress/plugin/funnel-builder/vulnerability/wordpress-funnelkit-funnel-builder-for-woocommerce-checkout-plugin-3-16-0-5-unauthenticated-stored-cross-site-scripting-vulnerability](https://patchstack.com/database/wordpress/plugin/funnel-builder/vulnerability/wordpress-funnelkit-funnel-builder-for-woocommerce-checkout-plugin-3-16-0-5-unauthenticated-stored-cross-site-scripting-vulnerability)
- [https://plugins.trac.wordpress.org/browser/funnel-builder/tags/3.16.0.5/modules/thankyou-pages/includes/class-wffn-ecomm-tracking.php#L1114](https://plugins.trac.wordpress.org/browser/funnel-builder/tags/3.16.0.5/modules/thankyou-pages/includes/class-wffn-ecomm-tracking.php#L1114)
- [https://plugins.trac.wordpress.org/browser/funnel-builder/tags/3.16.0.5/modules/thankyou-pages/includes/class-wffn-ecomm-tracking.php#L211](https://plugins.trac.wordpress.org/browser/funnel-builder/tags/3.16.0.5/modules/thankyou-pages/includes/class-wffn-ecomm-tracking.php#L211)
- [https://plugins.trac.wordpress.org/changeset/3733861/](https://plugins.trac.wordpress.org/changeset/3733861/)
- [https://plugins.trac.wordpress.org/changeset/3733886/funnel-builder/trunk/modules/thankyou-pages/includes/class-wffn-ecomm-tracking.php](https://plugins.trac.wordpress.org/changeset/3733886/funnel-builder/trunk/modules/thankyou-pages/includes/class-wffn-ecomm-tracking.php)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/1807b544-e5fd-403b-85a6-e20bd4f10dec?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/1807b544-e5fd-403b-85a6-e20bd4f10dec?source=cve)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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