Orckestra C1 CMS's deserialization of untrusted data allows for arbitrary code execution.
Impact
This vulnerability 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.
Patches
Patched in C1 CMS v6.13
Workarounds
Upgrade to C1 CMS v6.13 or newer is required
Credit
This issue was discovered and reported by Markus Wulftange / Code White GmbH.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | CompositeC1.Core | < 6.13 | 6.13 |
References
- https://github.com/Orckestra/C1-CMS-Foundation/security/advisories/GHSA-gfhp-jgp6-838j
- https://nvd.nist.gov/vuln/detail/CVE-2022-39256
- https://github.com/Orckestra/C1-CMS-Foundation/pull/814
- https://github.com/Orckestra/C1-CMS-Foundation/commit/af856ab5a62d19acf6aea1b1f4c6c3c4985c9446
- https://github.com/Orckestra/C1-CMS-Foundation
- https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.13
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- .NET (NuGet)
- Package
CompositeC1.Core- Disclosed
- 30.09.2022
- Updated
- 11.10.2026 11:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-gfhp-jgp6-838j - CC BY 4.0
Vulnerability history: CompositeC1.Core
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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