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Fencer Vulns
critical 9.0

CVE-2022-39256 json

Orckestra C1 CMS's deserialization of untrusted data allows for arbitrary code execution.

published 2022-09-27 4 y ago modified 2026-06-17 4 mo ago also GHSA-gfhp-jgp6-838j , EUVD-2022-6820

cvss
9.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

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.

Patch / fix

  • nuget CompositeC1.Core 6.13
  • orckestra c1_cms 6.13

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

1.66% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
NVD 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
GitHub 3.1 9.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget CompositeC1.Core
<6.13
6.13

Affected products

  • Orckestra C1-CMS-Foundation

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.