# CVE-2023-6723: Unrestricted Upload of File with Dangerous Type in Repox

> Attackers can upload malicious files to Repox via the transformationfileupload function, leading to full system compromise.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Dec 2023
- **Updated:** 22 May 2025
- **Also known as:** GHSA-qhj9-jqq3-357q

## What is CVE-2023-6723?

CVE-2023-6723 is a critical vulnerability in Repox, published on 13 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An unrestricted file upload vulnerability has been identified in Repbox, which allows an attacker to upload malicious files via the transforamationfileupload function, due to the lack of proper file type validation controls, resulting in a full system compromise.

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

## Which versions are affected by CVE-2023-6723?

It affects 1 product.


Products: Europeana Repox.

## How do I fix CVE-2023-6723?

No fix has been published for CVE-2023-6723 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6723 being exploited?

There is no known exploitation of CVE-2023-6723 in the wild and no public exploit code.

## Other vulnerabilities in Repox

- [CVE-2023-6718](https://insights.sbomify.com/CVE-2023-6718/): Authentication Bypass Using an Alternate Path or Channel in Repox (critical 9.4)
- [CVE-2023-6721](https://insights.sbomify.com/CVE-2023-6721/): Improper Restriction of XML External Entity Reference in Repox (high 8.3)
- [CVE-2023-6722](https://insights.sbomify.com/CVE-2023-6722/): Relative Path Traversal in Repox (high 7.5)
- [CVE-2023-6719](https://insights.sbomify.com/CVE-2023-6719/): Cross-site Scripting in Repox (medium 6.3)
- [CVE-2023-6720](https://insights.sbomify.com/CVE-2023-6720/): Cross-site Scripting in Repox (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6723 and fix it if it is affected.

What it is: CVE-2023-6723 is a critical vulnerability in Repox, published on 13 Dec 2023. 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-2023-6723 in the wild and no public exploit code.

Affected product: Repox. 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-2023-6723/ (Markdown: https://insights.sbomify.com/CVE-2023-6723/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6723
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6723
- OSV: https://osv.dev/vulnerability/CVE-2023-6723

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6723/
Summaries are generated and may contain mistakes; the official description above is the record.