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CVE-2026-87796

CriticalPublished

Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload

Published: Sep 17, 2026
Updated: Sep 19, 2026
Assigning CNA: Wordfence
Evidence observed: Sep 18, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 47.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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 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.

Sources

CVE-2026-87796PoC
Reproduction pack and PoC script for CVE-2026-87796, an unauthenticated arbitrary file upload RCE in Multi Uploader for Gravity Forms <= 1.1.9, with a loopback Docker lab.

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