CVE-2026-100147 teamfunnelkit CVE debrief

Who should care

Defenders responsible for WordPress installations with the FunnelKit – Funnel Builder for WooCommerce Checkout plugin should assess exposure and prioritize updating the plugin to a version beyond 3.16.0.5.

Why it matters

CVE-2026-100147 is a Stored Cross-Site Scripting vulnerability in FunnelKit – Funnel Builder for WooCommerce Checkout that allows unauthenticated attackers to inject web scripts. Defenders should prioritize verifying and updating the plugin, assessing exposure, and implementing compensating controls.

• Unauthenticated attackers can inject arbitrary web scripts
• Injected scripts execute when a user accesses an injected page
• Defenders must verify and update FunnelKit – Funnel Builder for WooCommerce Checkout
• Exposure requires assessment and compensating controls implementation

Technical summary

The FunnelKit – Funnel Builder for WooCommerce Checkout plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'shipping_first_name' parameter in all versions up to, and including, 3.16.0.5 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.

Defensive priority

Defenders should prioritize verifying and updating FunnelKit – Funnel Builder for WooCommerce Checkout to a version beyond 3.16.0.5, assessing exposure in their environment, and implementing compensating controls to detect and prevent exploitation.

Recommended defensive actions

• Verify and update FunnelKit – Funnel Builder for WooCommerce Checkout to a version beyond 3.16.0.5
• Assess exposure in the environment and implement compensating controls
• Monitor for suspicious activity and implement additional security measures
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, CVSS score, and affected versions. However, there is limited information on exploitation, impact, or remediation beyond updating the plugin.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.