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TI-2026-68444 Aliases CVE-2026-105791

Argument injection in Microsoft UFO run_shell enables code execution

Priority HIGH 68CWE-184Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-88.

Summary

Microsoft UFO versions before 3.0.9 are affected. The run_shell tool checks only the first token of its bash_command parameter and permits explorer.exe, which on Windows passes its path argument to ShellExecute (CWE-88). An attacker who induces an agent tool call can run an arbitrary executable or script as the desktop user, reaching that user's files, tokens and sessions. Exploitation requires a user to run an affected agent workflow.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00728 54th percentileScored 2026-11-07
Fix Fixed UFO (microsoft): 3.0.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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

VendorProductAffected versionsFixed inStatusSource
MicrosoftUFObefore 3.0.93.0.9Patch availableCNA
  • UFO VendorMicrosoft Affected before 3.0.9 Fixed in 3.0.9 Patch available CNA

Remediation

Update Microsoft UFO to version 3.0.9, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA UFO (microsoft) Fixed in 3.0.9

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-105791
  2. 2026-10-07 Priority changed: MEDIUM → LOW
  3. 2026-10-09 CISA SSVC decision points changed
  4. 2026-10-09 Priority changed: LOW → HIGH
  5. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 3

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

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