Siemens Desigo CC ClickOnce Client input validation

Summaryinfo

A vulnerability marked as problematic has been reported in Siemens Desigo CC ClickOnce Client, Desigo CC Flex Client, Desigo CC Installed Client and Desigo CC. Affected is an unknown function. This manipulation causes input validation. The identification of this vulnerability is CVE-2026-34223. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability has been found in Siemens Desigo CC ClickOnce Client, Desigo CC Flex Client, Desigo CC Installed Client and Desigo CC (the affected version is unknown) and classified as problematic. Affected by this vulnerability is an unknown code. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability has been identified in Desigo CC ClickOnce Client V6 (All versions), Desigo CC ClickOnce Client V7 (All versions), Desigo CC family V8 (All versions), Desigo CC family V9 (All versions), Desigo CC Flex Client V6 (All versions), Desigo CC Flex Client V7 (All versions), Desigo CC Installed Client V6 (All versions), Desigo CC Installed Client V7 (All versions). The affected application is vulnerable to Client Code Execution (CCE) due to insufficient input validation when handling scripts embedded within user-defined graphics documents. Specifically, when the script within a graphics document is designed or modified by an attacker to include malicious commands. When a user opens a compromised graphics document, the embedded script is executed on the client application instance, allowing an attacker to write arbitrary files to the client's operating system. Successful exploitation requires an attacker to craft a malicious graphics document and entice a user with sufficient privileges to display it. This could lead to compromise of the client operating system and potential lateral movement within the organization.

It is possible to read the advisory at cert-portal.siemens.com. This vulnerability is known as CVE-2026-34223 since 03/26/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/08/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Siemens

Name

• Desigo CC
• Desigo CC ClickOnce Client
• Desigo CC Flex Client
• Desigo CC Installed Client

License

• commercial

Website

• Vendor: https://www.siemens.com/

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