All vulnerabilities
CVE-2026-105791GHSA-cmq9-vqjf-4q2q

Microsoft UFO: Arbitrary code execution in `run_shell` via `explorer.exe` argument injection

microsoft UFO
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 9 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.62%Chance of exploitation activity in the next 30 days, higher than 49% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published6 Oct 2026Updated 9 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

Microsoft UFO is an open-source framework for intelligent automation across devices and platforms. Prior to 3.0.9, the run_shell tool in the CommandLineExecutor component of ufo/client/mcp/local_servers/cli_mcp_server.py validates only the first token of the bash_command parameter and permits explorer.exe. On Windows, explorer.exe delegates its following path argument to ShellExecute, so an attacker-influenced agent call can launch an arbitrary executable or script as the desktop user even though the subprocess uses shell=False. Exploitation depends on a user running an affected agent workflow and on inducing the tool call, but successful execution can access or modify that user's files, tokens, and sessions. This issue is fixed in version 3.0.9.

Text from CVE List

Affected versions 1

  • UFOaffected: < 3.0.9CVE List

References 3