# CVE-2023-2877: Formidable Forms < 6.3.1 - Subscriber+ Remote Code Execution

> A missing authorization flaw allows subscribers to install arbitrary plugins, leading to remote code execution on WordPress sites using Formidable Forms.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Jun 2023
- **Updated:** 3 Dec 2024
- **Also known as:** GHSA-2x7r-m54m-f2pf

## What is CVE-2023-2877?

CVE-2023-2877 is a high-severity missing authorization vulnerability in Unknown Formidable Forms, published on 27 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Formidable Forms WordPress plugin before 6.3.1 does not adequately authorize the user or validate the plugin URL in its functionality for installing add-ons. This allows a user with a role as low as Subscriber to install and activate arbitrary plugins of arbitrary versions from the WordPress.org plugin repository onto the site, leading to Remote Code Execution.

## Which versions are affected by CVE-2023-2877?

It affects 1 product.


Products: Strategy11 Formidable Forms.

## How do I fix CVE-2023-2877?

No fix has been published for CVE-2023-2877 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-2877 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-2877 exists.

Public exploit code:

- Formidable Forms < 6.3.1 - Subscriber+ Remote Code Execution (github_poc): https://github.com/RandomRobbieBF/CVE-2023-2877

## Other vulnerabilities in Unknown Formidable Forms

- [CVE-2023-1405](https://insights.sbomify.com/CVE-2023-1405/): Formidable Forms < 6.2 - Unauthenticated PHP Object Injection (high 7.5)
- [CVE-2024-11188](https://insights.sbomify.com/CVE-2024-11188/): Cross-site scripting in Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder (medium 6.1)
- [CVE-2024-0660](https://insights.sbomify.com/CVE-2024-0660/): Formidable Forms <= 6.7.2 - Cross-Site Request Forgery to Stored Cross-Site Scripting (medium 6.1)
- [CVE-2024-23522](https://insights.sbomify.com/CVE-2024-23522/): WordPress Formidable Forms plugin <= 6.7 - Content Injection vulnerability (medium 5.3)
- [CVE-2024-6725](https://insights.sbomify.com/CVE-2024-6725/): Formidable Forms <= 6.11.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2877 and fix it if it is affected.

What it is: CVE-2023-2877 is a high-severity missing authorization vulnerability in Unknown Formidable Forms, published on 27 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-2877 exists.

Affected product: Unknown Formidable 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-2023-2877/ (Markdown: https://insights.sbomify.com/CVE-2023-2877/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2877
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2877
- OSV: https://osv.dev/vulnerability/CVE-2023-2877

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2877/
Summaries are generated and may contain mistakes; the official description above is the record.