---
id: CVE-2026-109384
title: >-
  The Innovative Form Builder <= 1.5.1 - Authenticated (Custom+) Arbitrary File
  Upload via 'allowedFileExtensions' Configuration + Public /form/submission/
  Multipart Upload
summary: >-
  The The Innovative Form Builder – IvyForms plugin for WordPress is vulnerable
  to Arbitrary File Upload in all versions up to, and including, 1.5.1 via the
  filterFiletypeAndExt function. This is due to insufficient file type
  validation du…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-434
vendor: melograno
product: The Innovative Form Builder – IvyForms
affected:
  - the_innovative_form_builder_ivyforms <= 1.5.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-29T01:30:32.427822Z'
published: '2026-10-28'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T01:41:53.142Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109384'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/52ca2269-a7f4-477c-bacd-0321ad09e679?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/ivyforms/tags/1.5.1/backend/src/Services/Submission/SubmissionUploadFiletypeFilter.php#L68
  - url: >-
      https://plugins.trac.wordpress.org/browser/ivyforms/tags/1.5.1/backend/src/Services/Submission/SubmissionUploadFilePersister.php#L126
  - url: >-
      https://plugins.trac.wordpress.org/browser/ivyforms/tags/1.5.1/backend/src/Services/Submission/SubmissionUploadFileValidator.php#L127
  - url: >-
      https://plugins.trac.wordpress.org/browser/ivyforms/tags/1.5.1/backend/src/Common/Sanitizer/Sanitizer.php#L839
  - url: >-
      https://plugins.trac.wordpress.org/browser/ivyforms/tags/1.5.1/backend/src/Routes/Form/Form.php#L246
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3757861%40ivyforms&new=3757861%40ivyforms
tags:
  - cve.org
epss: 0.00725
epssPercentile: 0.54039
ingestedAt: '2026-10-28T07:06:27.119Z'
---

## Overview

The The Innovative Form Builder – IvyForms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.5.1 via the filterFiletypeAndExt function. This is due to insufficient file type validation due to the absence of a dangerous-extension denylist in the allowed-extensions sanitizer and deliberate override of WordPress's native MIME and extension defences via a registered wp_check_filetype_and_ext filter. This makes it possible for authenticated attackers, with custom-level access and above, to upload files that may be executable, which makes remote code execution possible. An authenticated attacker with the custom add_edit_forms capability must first configure a File Upload field with a dangerous extension (e.g., php) in the allowed-extensions list; once that form is published, any unauthenticated visitor can trigger the actual file upload via the publicly accessible /wp-json/ivyforms/v1/form/submission/ REST route.

## Affected

- `the_innovative_form_builder_ivyforms <= 1.5.1`

## Remediation

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