CVE-2026-57816 FunnelKit CVE debrief

Who should care

Administrators and users of Funnel Builder by FunnelKit versions from n/a through <= 3.15.0.8 should be aware of this vulnerability. Additionally, security teams, vulnerability management teams, and operators of affected systems should prioritize updating Funnel Builder by FunnelKit to a version that is not vulnerable. It is also essential for defenders to monitor for any suspicious activity on the affected systems and consider implementing additional security measures to prevent XSS attacks.

Technical summary

The CVE-2026-57816 vulnerability is a Cross-site Scripting (XSS) issue in Funnel Builder by FunnelKit. The vulnerability is rated as HIGH with a CVSS score of 7.1. The affected versions are from n/a through <= 3.15.0.8. The vulnerability allows an attacker to inject malicious scripts into the application, potentially leading to unauthorized actions or data breaches. It is essential to update Funnel Builder by FunnelKit to a version that is not vulnerable.

Defensive priority

High priority should be given to updating Funnel Builder by FunnelKit to a version that is not vulnerable. Defenders should also monitor for any suspicious activity on the affected systems and consider implementing additional security measures to prevent XSS attacks.

Recommended defensive actions

• Update Funnel Builder by FunnelKit to a version that is not vulnerable.
• Monitor for any suspicious activity on the affected systems.
• Consider implementing additional security measures to prevent XSS attacks.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record was published on 2026-07-13T10:16:45.620Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability is a Cross-site Scripting (XSS) issue in Funnel Builder by FunnelKit, affecting versions from n/a through <= 3.15.0.8.

Official resources