CVE-2022-39256Network attack vector

RCE via unchecked generic type arguments

Published Sep 27, 2022 · Updated Apr 23, 2025

Deserialization in Orckestra C1 CMS before 6.13 allows remote attackers to execute arbitrary code through an authenticated Console user. CompositeSerializationBinder validated the outer type but failed to recursively validate generic type arguments supplied in serialized JSON. A C1 Console user at any access level must be signed in and visit a specially crafted site, after which attacker-selected code runs on the website.

CVSS severity9.0
Critical
EPSS probability1.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Orckestra C1 CMS before 6.13 allows remote attackers to execute arbitrary code through an authenticated Console user. CompositeSerializationBinder validated the outer type but failed to recursively validate generic type arguments supplied in serialized JSON. A C1 Console user at any access level must be signed in and visit a specially crafted site, after which attacker-selected code runs on the website.

The record

CVE
CVE-2022-39256
Published
Sep 27, 2022
Updated
Apr 23, 2025
Vendor
Orckestra
Product
C1 CMS Foundation
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Orckestra · C1 CMS Foundationversion=< 6.13

Published CVSS scores

9.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
8.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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