What is CVE-2022-39256?

CVE-2022-39256 is a critical-severity insecure deserialization vulnerability in CompositeC1.Core (nuget), affecting versions < 6.13. It is fixed in 6.13. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.

How severe is CVE-2022-39256?

CVE-2022-39256 has a CVSS score of 9.0 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of CompositeC1.Core are affected by CVE-2022-39256?

CompositeC1.Core (nuget) versions < 6.13 is affected.

Is there a fix for CVE-2022-39256?

Yes. CVE-2022-39256 is fixed in 6.13. Upgrade to this version or later.

Is CVE-2022-39256 exploitable, and should I be worried?

Whether CVE-2022-39256 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2022-39256 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

How do I fix CVE-2022-39256?

Upgrade CompositeC1.Core to 6.13 or later.

CVE-2022-39256 in CompositeC1.Core

Q: How severe is CVE-2022-39256?

CVE-2022-39256 has a CVSS score of 9.0 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of CompositeC1.Core are affected by CVE-2022-39256?

CompositeC1.Core (nuget) versions < 6.13 is affected.

Q: Is there a fix for CVE-2022-39256?

Yes. CVE-2022-39256 is fixed in 6.13. Upgrade to this version or later.

Q: Is CVE-2022-39256 exploitable, and should I be worried?

Whether CVE-2022-39256 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2022-39256 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2022-39256?

Upgrade CompositeC1.Core to 6.13 or later.

Summary

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

Workarounds

Upgrade to C1 CMS v6.13 or newer is required

Credit

This issue was discovered and reported by Markus Wulftange / Code White GmbH.

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.

Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect. Typical impact: arbitrary code execution or logic abuse.

CVE-2022-39256 has a CVSS score of 9.0 (Critical). The vector is network-reachable, low privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (6.13); upgrading removes the vulnerable code path.

Affected versions

CompositeC1.Core (< 6.13)

Security releases

CompositeC1.Core → 6.13 (nuget)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Patched in C1 CMS v6.13

Frequently Asked Questions

What is CVE-2022-39256? CVE-2022-39256 is a critical-severity insecure deserialization vulnerability in CompositeC1.Core (nuget), affecting versions < 6.13. It is fixed in 6.13. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.
How severe is CVE-2022-39256? CVE-2022-39256 has a CVSS score of 9.0 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of CompositeC1.Core are affected by CVE-2022-39256? CompositeC1.Core (nuget) versions < 6.13 is affected.
Is there a fix for CVE-2022-39256? Yes. CVE-2022-39256 is fixed in 6.13. Upgrade to this version or later.
Is CVE-2022-39256 exploitable, and should I be worried? Whether CVE-2022-39256 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2022-39256 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2022-39256? Upgrade CompositeC1.Core to 6.13 or later.