# CVE-2022-39256: Orckestra C1 CMS's deserialization of untrusted data allows for arbitrary code execution.

> Authenticated attackers can execute arbitrary code on Orckestra C1 CMS installations by visiting a specially crafted site.

- **Severity:** Critical 9.0 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 27 Sep 2022
- **Updated:** 23 Apr 2025
- **Also known as:** GHSA-gfhp-jgp6-838j

## What is CVE-2022-39256?

CVE-2022-39256 is a critical unsafe deserialization vulnerability in Orckestra C1-CMS-Foundation, published on 27 Sep 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Orckestra C1 CMS is a .NET based Web Content Management System. A vulnerability in versions prior to 6.13 allows remote attackers to execute arbitrary code on affected installations of Orckestra C1 CMS. Authentication is required to exploit this vulnerability. The authenticated user may perform the actions unknowingly by visiting a specially crafted site. This issue is patched in C1 CMS v6.13. There are no known workarounds.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2022-39256?

2 open source packages ship an affected version, including CompositeC1.Core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `CompositeC1.Core` | NuGet | All versions | 6.13 |
| `CompositeC1.Core` | NuGet | All versions | 6.13 |

Products: Orckestra C1 Cms.

## How do I fix CVE-2022-39256?

Upgrade CompositeC1.Core to 6.13 or later.

## Is CVE-2022-39256 being exploited?

There is no known exploitation of CVE-2022-39256 in the wild and no public exploit code.

## Other vulnerabilities in Orckestra C1-CMS-Foundation

- [CVE-2021-34992](https://insights.sbomify.com/CVE-2021-34992/): Deserialization in C1 CMS (high 8.8)
- [CVE-2019-18211](https://insights.sbomify.com/CVE-2019-18211/): Deserialization in n/a (high 8.8)
- [CVE-2022-24789](https://insights.sbomify.com/CVE-2022-24789/): Deserialization of untrusted data in C1 CMS. (high 7.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-39256 and fix it if it is affected.

What it is: CVE-2022-39256 is a critical unsafe deserialization vulnerability in Orckestra C1-CMS-Foundation, published on 27 Sep 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2022-39256 in the wild and no public exploit code.

Affected packages and fixed versions:
- CompositeC1.Core (NuGet): affected all versions; fixed in 6.13
- CompositeC1.Core (NuGet): affected all versions; fixed in 6.13

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-2022-39256/ (Markdown: https://insights.sbomify.com/CVE-2022-39256/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-39256
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-39256
- OSV: https://osv.dev/vulnerability/CVE-2022-39256

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-39256/
Summaries are generated and may contain mistakes; the official description above is the record.