SB2026101487 - OS Command Injection in Azure CycleCloud

Description

This security bulletin contains information about 1 vulnerability.

1) OS Command Injection (CVE-ID: CVE-2026-100207)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to execute arbitrary code on a connecting workstation.

The vulnerability exists due to improper neutralization of special elements used in an OS command in Azure CycleCloud when connecting to a Windows node using the Azure CycleCloud CLI from a macOS or Linux workstation. A local user can configure specially crafted Windows node credentials to execute arbitrary code on a connecting workstation.

Exploitation requires permission to create or manage a cluster and configure the node's credentials. A different user must initiate the CLI connection.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-100207
• https://learn.microsoft.com/en-us/azure/cyclecloud/release-notes/8-9-2?view=cyclecloud-8