high severity September 22, 2026 · 1 min read

CISA ICS Advisory: Siemens Desigo CC family

Here’s what this advisory affects, and what to do about it.

A Client Code Execution (CCE) vulnerability has been identified in Desigo CC, potentially allowing malicious actors to execute arbitrary code on client devices through specially crafted graphics documents. This vulnerability leverages user-defined graphics containing embedded scripts that are executed on client application instances. Successful exploitation could lead to compromise of the client operating system and potential lateral movement within the organization. The following versions of Siemens Desigo CC family are affected: Desigo CC family V6 vers:all/* (CVE-2026-34223)

CISA ICS Advisory: Siemens Desigo CC family

CISA published an ICS advisory on September 22, 2026, warning that a Client Code Execution vulnerability exists in the Siemens Desigo CC family.

Client code execution via crafted graphics

The advisory describes a vulnerability that allows malicious actors to supply specially crafted graphics documents containing embedded scripts. These scripts execute automatically when the document is opened in a Desigo CC client application. The flaw stems from the way the product processes user-defined graphics that include executable script content.

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CVE-2026-34223 is assigned to this issue. The advisory does not state whether the vulnerability has been exploited in the wild.

Affected products

The advisory identifies the following as affected:

Desigo CC family V6 — all versions

No other versions or Siemens products are named in the advisory.

What to do

Determine whether any Desigo CC V6 client instances are deployed in your environment.
Apply the update or mitigation published by Siemens for CVE-2026-34223.
Restrict the use of untrusted or external graphics documents within Desigo CC client applications.
Monitor Siemens’ official security channel for additional patches or workarounds.
Review network segmentation controls to limit potential lateral movement from compromised client workstations.

Organizations operating industrial control systems or building automation environments should treat client-side code execution flaws in engineering and monitoring workstations as high priority due to their position in operational technology networks.

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Sources: CISA ICS Advisory

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