---
id: CVE-2026-19857
title: >-
  The Formidable Forms WordPress plugin before 6.35 does not prevent a
  request-derived value from reaching the WordPress shortcode parser when it
  substitutes a supported token into a form's custom HTML, allowing
  unauthenticated visitors to…
summary: >-
  The Formidable Forms WordPress plugin before 6.35 does not prevent a
  request-derived value from reaching the WordPress shortcode parser when it
  substitutes a supported token into a form's custom HTML, allowing
  unauthenticated visitors to…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-74
product: Formidable Forms
affected:
  - formidable_forms >= 6.34 < 6.35
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:25:29.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19857'
references:
  - url: 'https://wpscan.com/vulnerability/5ff439f4-aa99-4198-b908-0cf098656cf7/'
    label: contact@wpscan.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-16T17:40:23.986926Z'
ingestedAt: '2026-09-16T06:51:06.263Z'
epss: 0.00188
epssPercentile: 0.07581
---

## Overview

The Formidable Forms WordPress plugin before 6.35 does not prevent a request-derived value from reaching the WordPress shortcode parser when it substitutes a supported token into a form's custom HTML, allowing unauthenticated visitors to have arbitrary shortcodes, with attacker-chosen attributes, executed server-side on any page displaying an affected form.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.