# CVE-2023-6133: Forminator <= 1.27.0 - Authenticated (Administrator+) Arbitrary File Upload

> Administrators can upload arbitrary files due to insufficient MIME type blacklisting, though remote code execution is prevented by htaccess.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Nov 2023
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-9w33-c6rh-4qfg

## What is CVE-2023-6133?

CVE-2023-6133 is a medium-severity vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, published on 15 Nov 2023. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The Forminator plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient blacklisting on the 'forminator_allowed_mime_types' function in versions up to, and including, 1.27.0. This makes it possible for authenticated attackers with administrator-level capabilities or above to upload arbitrary files on the affected site's server, but due to the htaccess configuration, remote code cannot be executed.

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

## Which versions are affected by CVE-2023-6133?

It affects 1 product.


Products: Incsub Forminator.

## How do I fix CVE-2023-6133?

No fix has been published for CVE-2023-6133 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6133 being exploited?

There is no known exploitation of CVE-2023-6133 in the wild and no public exploit code.

## Other vulnerabilities in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder

- [CVE-2023-4596](https://insights.sbomify.com/CVE-2023-4596/): Forminator <= 1.24.6 - Unauthenticated Arbitrary File Upload (critical 9.8)
- [CVE-2025-6463](https://insights.sbomify.com/CVE-2025-6463/): Path traversal in Forminator Forms – Contact Form, Payment Form & Custom Form Builder (high 8.8)
- [CVE-2025-6464](https://insights.sbomify.com/CVE-2025-6464/): Deserialization in Forminator Forms – Contact Form, Payment Form & Custom Form Builder (high 7.5)
- [CVE-2024-7389](https://insights.sbomify.com/CVE-2024-7389/): Forminator <= 1.29.1 - HubSpot Developer API Key Sensitive Information Exposure (high 7.5)
- [CVE-2024-31077](https://insights.sbomify.com/CVE-2024-31077/): SQL injection in Forminator (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6133 and fix it if it is affected.

What it is: CVE-2023-6133 is a medium-severity vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, published on 15 Nov 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-6133 in the wild and no public exploit code.

Affected product: wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder. 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-2023-6133/ (Markdown: https://insights.sbomify.com/CVE-2023-6133/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6133
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6133
- OSV: https://osv.dev/vulnerability/CVE-2023-6133

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-6133/
Summaries are generated and may contain mistakes; the official description above is the record.