# CVE-2026-57373: Wisetr Funnel Kit Funnel Builder PRO XSS in WordPress plugin

Source: https://junglewise.ai/threats/cve-2026-57373-wisetr-funnel-kit-funnel-builder-pro-xss-in-wordpress-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-23. Updated: 2026-07-23  
License: CC BY 4.0 with a link back

CVE-2026-57373 · Severity: medium · CVSS 6.5 · Published 2026-07-23

Funnel Kit Funnel Builder PRO, a popular WordPress plugin used for creating sales funnels and marketing pages, contains a security vulnerability that could allow attackers to inject malicious scripts into the website. If an attacker successfully exploits this, they could redirect visitors to malicious sites, steal session information, or display unauthorized advertisements. This risk is particularly relevant for sites with customer accounts, as the attack can be initiated by users with low-level 'Customer' privileges.

Vendors: [FunnelKit](https://junglewise.ai/threats/vendors/funnelkit).

## Quick answers

**Is CVE-2026-57373 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57373 being exploited in the wild.

**How severe is CVE-2026-57373?** Medium severity, with a CVSS score of 6.5, published 23 July 2026.

**Which products and versions are affected?** Wisetr INC. Funnel Kit Funnel Builder PRO <= 3.15.0.4.

**Is there a fix for CVE-2026-57373?** A patch was published on 2026-07-23: Patch confirmed available in version 3.15.0.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-57373 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-57373?** Check whether you run FunnelKit FunnelBuilder Pro. 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

A Cross-Site Scripting (XSS) vulnerability exists in Funnel Kit Funnel Builder PRO versions up to and including 3.15.0.4 due to improper neutralization of input during web page generation (CWE-79). The vulnerability requires 'Customer' level privileges (PR:L) and some degree of user interaction (UI:R) from a more privileged user, such as an administrator viewing a crafted page. Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser, potentially leading to session hijacking or unauthorized administrative actions. The issue is resolved in version 3.15.0.5.

## Affected products

- Wisetr INC. Funnel Kit Funnel Builder PRO <= 3.15.0.4

## Timeline

- 2026-05-13: other: Reported by Austin Ginder
- 2026-07-07: disclosed: Initial disclosure by Patchstack
- 2026-07-23: advisory: NVD publication date
- 2026-07-23: patched: Patch confirmed available in version 3.15.0.5

## References

- [https://patchstack.com/database/wordpress/plugin/funnel-builder-pro/vulnerability/wordpress-funnel-kit-funnel-builder-pro-plugin-3-15-0-4-cross-site-scripting-xss-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/funnel-builder-pro/vulnerability/wordpress-funnel-kit-funnel-builder-pro-plugin-3-15-0-4-cross-site-scripting-xss-vulnerability?_s_id=cve)