# CVE-2023-4220: Chamilo LMS Unauthenticated Big Upload File Remote Code Execution


- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 28 Nov 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-9wc2-3gq5-2f4c

## What is CVE-2023-4220?

CVE-2023-4220 is a high-severity vulnerability in Chamilo Chamilo Lms, published on 28 Nov 2023. 

### Official description

Unrestricted file upload in big file upload functionality in `/main/inc/lib/javascript/bigupload/inc/bigUpload.php` in Chamilo LMS <= v1.11.24 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via uploading of web shell.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2023-4220?

It affects 1 product.


Products: Chamilo Chamilo Lms.

## How do I fix CVE-2023-4220?

No fix has been published for CVE-2023-4220 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-4220 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-4220 exists.

Public exploit code:

- This is a script written in Python that allows the exploitation of the Chamilo's LMS software security flaw described in CVE-2023-4220 (github_poc): https://github.com/Rai2en/CVE-2023-4220-Chamilo-LMS
- This is an Exploit for Unrestricted file upload in big file upload functionality in Chamilo-LMS for this location "/main/inc/lib/javascript/bigupload/inc/bigUpload.php" in Chamilo LMS <= v1.11.24, and Attackers can obtain remote code execution via uploading of web shell. (github_poc): https://github.com/Ziad-Sakr/Chamilo-CVE-2023-4220-Exploit
- Python exploit for Chamilo Unrestricted File Upload Vuln - CVE-2023-4220 (github_poc): https://github.com/thefizzyfish/CVE-2023-4220_Chamilo_RCE
- Chamilo LMS Unauthenticated Remote Code Execution (github_poc): https://github.com/N1ghtfallXxX/CVE-2023-4220
- Unrestricted file upload in big file upload functionality in `/main/inc/lib/javascript/bigupload/inc/bigUpload.php` in Chamilo LMS <= v1.11.24 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via uploading of web shell. (github_poc): https://github.com/dollarboysushil/Chamilo-LMS-Unauthenticated-File-Upload-CVE-2023-4220
- (CVE-2023-4220) Chamilo LMS Unauthenticated Big Upload File Remote Code Execution  (github_poc): https://github.com/0x00-null/Chamilo-CVE-2023-4220-RCE-Exploit

## Other vulnerabilities in Chamilo Chamilo Lms

- [CVE-2025-50187](https://insights.sbomify.com/CVE-2025-50187/): Chamilo: Evaluation of untrusted user input leads to Remote Code Execution (critical 9.8)
- [CVE-2023-34944](https://insights.sbomify.com/CVE-2023-34944/): File upload in n/a (critical 9.8)
- [CVE-2022-27423](https://insights.sbomify.com/CVE-2022-27423/): SQL injection in n/a (critical 9.8)
- [CVE-2021-35414](https://insights.sbomify.com/CVE-2021-35414/): SQL injection in n/a (critical 9.8)
- [CVE-2019-13082](https://insights.sbomify.com/CVE-2019-13082/): File upload in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-4220 and fix it if it is affected.

What it is: CVE-2023-4220 is a high-severity vulnerability in Chamilo Chamilo Lms, published on 28 Nov 2023. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-4220 exists.

Affected product: Chamilo Chamilo Lms. 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-2023-4220/ (Markdown: https://insights.sbomify.com/CVE-2023-4220/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-4220
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-4220
- OSV: https://osv.dev/vulnerability/CVE-2023-4220

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-4220/
Summaries are generated and may contain mistakes; the official description above is the record.