TI-2026-26518 Aliases CVE-2026-34223 GHSA-3r86-r8f3-cmm5

Code injection in Siemens Desigo CC ClickOnce Client V6

LOW 39CWE-94Published 2026-09-08 · Updated 2026-09-14

Key facts

Attack vector: Local
Privileges required: Low
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00194 9th percentileScored 2026-11-07

Fix Fixed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Siemens	Desigo CC ClickOnce Client V6	all versions	—	No fix listed	CNA
Siemens	Desigo CC ClickOnce Client V7	all versions	—	No fix listed	CNA
Siemens	Desigo CC Installed Client V6	all versions	—	No fix listed	CNA
Siemens	Desigo CC Installed Client V7	all versions	—	No fix listed	CNA

Desigo CC ClickOnce Client V6 VendorSiemens Affected all versions Fixed in — No fix listed CNA
Desigo CC ClickOnce Client V7 VendorSiemens Affected all versions Fixed in — No fix listed CNA
Desigo CC Installed Client V6 VendorSiemens Affected all versions Fixed in — No fix listed CNA
Desigo CC Installed Client V7 VendorSiemens Affected all versions Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-34223
2026-10-03 Alias added: GHSA-3r86-r8f3-cmm5

References

Other 1

https://cert-portal.siemens.com/productcert/html/ssa-330084.html

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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences