# CVE-2026-84750: Ultimate Addons for Contact Form 7 3.2.4 - 3.5.50 - Unauthenticated Arbitrary File Upload via Signature Field

> Unauthenticated attackers can upload arbitrary files to the WordPress plugin, leading to remote code execution or stored XSS depending on server configuration.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Sep 2026
- **Updated:** 19 Sep 2026
- **Also known as:** GHSA-cq73-82v9-gx86

## What is CVE-2026-84750?

CVE-2026-84750 is a medium-severity vulnerability in Unknown Ultra Addons for Contact Form 7, published on 19 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Ultra Addons for Contact Form 7 WordPress plugin before 3.5.51 does not validate the type or extension of files uploaded through one of its form fields, and stores them at a predictable public path with the attacker-chosen extension intact, allowing unauthenticated users to upload arbitrary files. The PHP handler shipped by default with the Debian and Ubuntu Apache packages maps .phar to PHP alongside .php and .phtml, so on that stack the uploaded file is executed and the issue leads to Remote Code Execution and full site takeover. Where the host routes only .php to the PHP handler, the same file is instead served from the site's own origin with its script intact, leading to Stored Cross-Site Scripting.

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

## Which versions are affected by CVE-2026-84750?


## How do I fix CVE-2026-84750?

No fix has been published for CVE-2026-84750 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-84750 being exploited?

There is no known exploitation of CVE-2026-84750 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-84750 and fix it if it is affected.

What it is: CVE-2026-84750 is a medium-severity vulnerability in Unknown Ultra Addons for Contact Form 7, published on 19 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-2026-84750 in the wild and no public exploit code.

Affected product: Unknown Ultra Addons for Contact Form 7. 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-2026-84750/ (Markdown: https://insights.sbomify.com/CVE-2026-84750/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-84750
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84750
- OSV: https://osv.dev/vulnerability/CVE-2026-84750

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-84750/
Summaries are generated and may contain mistakes; the official description above is the record.