CVE-2026-57816

HIGH

WordPress Funnel Builder by FunnelKit plugin <= 3.15.0.8 - Cross Site Scripting (XSS) vulnerability

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-57816. PoCs published by incogbyte.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-57816, a stored XSS vulnerability in Funnel Builder by FunnelKit <= 3.15.0.8. The exploit demonstrates how an attacker can inject malicious JavaScript via the unescaped 'header_css' checkout page setting, which is rendered on public-facing checkout pages without authentication.

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FunnelKit Funnel Builder by FunnelKit funnel-builder allows Reflected XSS.This issue affects Funnel Builder by FunnelKit: from n/a through <= 3.15.0.8.

Exploits (1)

github WORKING POC 3 stars
by incogbyte · pythonpoc
https://github.com/incogbyte/wp-cve-exploits/tree/main/CVE-2026-57816

This repository contains a functional exploit for CVE-2026-57816, a stored XSS vulnerability in Funnel Builder by FunnelKit <= 3.15.0.8. The exploit demonstrates how an attacker can inject malicious JavaScript via the unescaped 'header_css' checkout page setting, which is rendered on public-facing checkout pages without authentication.

Classification
Working Poc 99%
Attack Type
Xss
Complexity
Moderate
Reliability
Reliable
Target: Funnel Builder by FunnelKit <= 3.15.0.8
No auth needed
Prerequisites: Access to a WordPress installation with Funnel Builder by FunnelKit <= 3.15.0.8 installed · Ability to store the payload in the '_wfacp_page_settings' meta of a 'wfacp_checkout' post (requires design/write access to a checkout page) · A visitor to trigger the payload by accessing the checkout page
mistral-large-3 · analyzed Jul 14, 2026 Full analysis →

References (1)

Core 1

Scores

CVSS v3 7.1
EPSS 0.0014
EPSS Percentile 4.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
FunnelKit/Funnel Builder by FunnelKit < 3.15.0.8
Published Jul 13, 2026
Tracked Since Jul 13, 2026