# CVE-2023-6239: Incorrect calculation of effective permissions

> Incorrect permission calculation in M-Files Server allows unauthorized access to objects under specific metadata configurations.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **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:** 28 Nov 2023
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-xjc5-m98p-6f2c

## What is CVE-2023-6239?

CVE-2023-6239 is a medium-severity missing authorization vulnerability in M-Files Server, published on 28 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Under rare conditions, the effective permissions of an object might be incorrectly calculated if the object has a specific configuration of metadata-driven permissions in M-Files Server versions 23.9, 23.10, and 23.11 before 23.11.13168.7, potentially enabling unauthorized access to the object.

Weakness: CWE-281 (Improper Preservation of Permissions)

## Which versions are affected by CVE-2023-6239?

It affects 1 product.


Products: M-Files M-Files Server.

## How do I fix CVE-2023-6239?

No fix has been published for CVE-2023-6239 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6239 being exploited?

There is no known exploitation of CVE-2023-6239 in the wild and no public exploit code.

## Other vulnerabilities in M-Files Server

- [CVE-2024-10127](https://insights.sbomify.com/CVE-2024-10127/): Support for authentication bypass condition in M-Files LDAP authentication (critical 9.2)
- [CVE-2025-5964](https://insights.sbomify.com/CVE-2025-5964/): Path traversal in M-Files API (high 8.4)
- [CVE-2024-6789](https://insights.sbomify.com/CVE-2024-6789/): Path traversal in M-Files API (high 8.4)
- [CVE-2024-4056](https://insights.sbomify.com/CVE-2024-4056/): Denial of service condition in M-Files Server (high 7.5)
- [CVE-2023-6912](https://insights.sbomify.com/CVE-2023-6912/): Brute force vulnerability in M-Files user authentication (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6239 and fix it if it is affected.

What it is: CVE-2023-6239 is a medium-severity missing authorization vulnerability in M-Files Server, published on 28 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-6239 in the wild and no public exploit code.

Affected product: M-Files Server. 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-2023-6239/ (Markdown: https://insights.sbomify.com/CVE-2023-6239/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6239
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6239
- OSV: https://osv.dev/vulnerability/CVE-2023-6239

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6239/
Summaries are generated and may contain mistakes; the official description above is the record.