# CVE-2020-27387: File upload in n/a

> Authenticated attackers can upload and execute arbitrary PHP code in HorizontCMS by renaming files to have a PHP extension.

- **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:** 5 Nov 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fmrq-56mh-96f5

## What is CVE-2020-27387?

CVE-2020-27387 is a high-severity vulnerability in n/a, published on 5 Nov 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An unrestricted file upload issue in HorizontCMS through 1.0.0-beta allows an authenticated remote attacker (with access to the FileManager) to upload and execute arbitrary PHP code by uploading a PHP payload, and then using the FileManager's rename function to provide the payload (which will receive a random name on the server) with the PHP extension, and finally executing the PHP file via an HTTP GET request to /storage/<php_file_name>. NOTE: the vendor has patched this while leaving the version number at 1.0.0-beta.

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

## Which versions are affected by CVE-2020-27387?

It affects 1 product.


Products: Horizontcms Project Horizontcms.

## How do I fix CVE-2020-27387?

No fix has been published for CVE-2020-27387 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27387 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-27387 exists.

Public exploit code:

- HorizontCMS Arbitrary PHP File Upload (metasploit)

## Other vulnerabilities in n/a

- [CVE-2021-28428](https://insights.sbomify.com/CVE-2021-28428/): File upload in n/a (critical 9.8)
- [CVE-2020-28693](https://insights.sbomify.com/CVE-2020-28693/): File upload in n/a (high 8.8)
- [CVE-2022-25104](https://insights.sbomify.com/CVE-2022-25104/): Path traversal in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27387 and fix it if it is affected.

What it is: CVE-2020-27387 is a high-severity vulnerability in n/a, published on 5 Nov 2020. 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-2020-27387 exists.

Affected product: n/a. 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-2020-27387/ (Markdown: https://insights.sbomify.com/CVE-2020-27387/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27387
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27387
- OSV: https://osv.dev/vulnerability/CVE-2020-27387

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27387/
Summaries are generated and may contain mistakes; the official description above is the record.