Microsoft UFO: Arbitrary file write in the Linux MCP `execute_command` tool

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Summary

CVECVE-2026-105789
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 14:17:40 UTC
Updated2026-10-06 15:18:12 UTC
DescriptionMicrosoft UFO is an open-source framework for intelligent automation across devices and platforms. Prior to 3.0.9, the execute_command tool in ufo/client/mcp/http_servers/linux_mcp_server.py treats sort and uniq as read-only commands while the free-form command parameter can select their file-output forms. An authenticated caller can use sort -o or the optional second uniq operand to create or overwrite files writable by the UFO server process without shell metacharacters, because the allowed binary opens the destination itself and the argument policy does not reject the operation. This can corrupt configuration or other writable data and disrupt the service, but the demonstrated primitive does not directly disclose files or establish arbitrary code execution. This issue is fixed in version 3.0.9.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L

Problem Types: CWE-88 | CWE-184 | CWE-88 CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') | CWE-184 CWE-184: Incomplete List of Disallowed Inputs

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft UFO affected < 3.0.9 Not specified

References

ReferenceSourceLinkTags
github.com/microsoft/UFO/security/advisories/GHSA-85w2-wggf-rw49 [email protected] github.com
github.com/microsoft/UFO/commit/4f793622794f5d47810d54bed431c61f6a781dd6 [email protected] github.com
github.com/microsoft/UFO/releases/tag/v3.0.9 [email protected] github.com
github.com/microsoft/UFO/pull/349 [email protected] github.com
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