# CVE-2026-87796: Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload

> Unauthenticated attackers can upload arbitrary files via chunked uploads, potentially leading to remote code execution on WordPress sites using this plugin.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Sep 2026
- **Updated:** 19 Sep 2026
- **Also known as:** GHSA-h7vp-g8q2-89c8

## What is CVE-2026-87796?

CVE-2026-87796 is a critical vulnerability in sh1zen Multi Uploader for Gravity Forms, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-87796?


## How do I fix CVE-2026-87796?

No fix has been published for CVE-2026-87796 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-87796 being exploited?

There is no known exploitation of CVE-2026-87796 in the wild and no public exploit code.

Public exploit code:

- CVE-2026-87796 - Multi Uploader for Gravity Forms <= 1.1.9; Unauthorized RCE (CRITICAL 9.8) (github_poc): https://github.com/abraxas/CVE-2026-87796

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-87796 and fix it if it is affected.

What it is: CVE-2026-87796 is a critical vulnerability in sh1zen Multi Uploader for Gravity Forms, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-87796 in the wild and no public exploit code.

Affected product: sh1zen Multi Uploader for Gravity Forms. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-87796/ (Markdown: https://insights.sbomify.com/CVE-2026-87796/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-87796
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-87796
- OSV: https://osv.dev/vulnerability/CVE-2026-87796

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-87796/
Summaries are generated and may contain mistakes; the official description above is the record.