---
id: CVE-2026-87796
title: >-
  The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to
  Arbitrary File Upload in all versions up to, and including, 1.1.9 via the
  move_file function
summary: >-
  The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to
  Arbitrary File Upload in all versions up to, and including, 1.1.9 via the
  move_file function. This is due to insufficient file type validation during
  chunked uplo…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
vendor: sh1zen
product: Multi Uploader for Gravity Forms
affected:
  - multi_uploader_for_gravity_forms <= 1.1.9
published: '2026-09-17'
updated: '2026-09-19'
sourceUpdated: '2026-09-19T03:17:15.720'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87796'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/GFMUAddon.class.php#L125
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMUHandlePluploader.class.php#L257
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L319
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L322
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php#L560
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/47337bc1-fa3d-470c-9524-859295261017?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.00611
epssPercentile: 0.4759
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/abraxas/CVE-2026-87796'
  checkedAt: '2026-09-21T15:31:12.089Z'
exploitAvailable: true
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-19T02:13:03.996816Z'
ingestedAt: '2026-09-17T05:11:38.051Z'
---

## Overview

The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.1.9 via the move_file function. This is due to insufficient file type validation during chunked upload handling. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

## Remediation

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