CVE-2022-39256: Orckestra C1 CMS is a .NET based Web Content Management System

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

c1 cms: upgrade to 6.13. Exact commands for each OS are on this page.

Q: Is CVE-2022-39256 being exploited?

CVE-2022-39256 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-39256 affect?

CVE-2022-39256 affects c1 cms. Severity is critical (CVSS 9.0). 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

Q: How urgent is CVE-2022-39256?

Priority 51/100. Critical severity

This month

CRITICAL 9.0UPGRADE

CVE-2022-39256 is a critical-severity flaw (CVSS 9.0) affecting c1 cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-502
Published	2022-09-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: orckestra

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-09-27 15:15 UTCPublished CVE record published
2026-06-17 04:58 UTCUpdated Record last modified

orckestra c1 cms UPGRADE

Affected: < 6.13

Fixed in: 6.13

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy c1-cms || rpm -q c1-cms || c1-cms --version

2. UPGRADE to 6.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade c1-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade c1-cms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-39256?

c1 cms: upgrade to 6.13. Exact commands for each OS are on this page.

Is CVE-2022-39256 being exploited?

CVE-2022-39256 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-39256 affect?

CVE-2022-39256 affects c1 cms. Severity is critical (CVSS 9.0). 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

How urgent is CVE-2022-39256?

Priority 51/100. Critical severity

Related CVEs

CVE-2022-24789 HIGH 7.6 UPGRADE C1 CMS is an open-source, .NET based Content Management System (CMS)
CVE-2021-34992 HIGH 8.8 DOWNGRADE This vulnerability allows remote attackers to execute arbitrary code on affected installations of Orckestra C1

References

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