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TI-2026-32409 Aliases CVE-2026-44470

Claude Desktop: Local Privilege Escalation via Directory Junction in CoworkVMService

Priority LOW 38CWE-269Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-269.

Summary

The Claude Desktop app gives you Claude Code with a graphical interface built for running multiple sessions side by side. Prior to 1.3834.0, the CoworkVMService component in Claude Desktop for Windows ran as SYSTEM and did not validate whether the VM bundle directory was a real directory or an NTFS directory junction before creating files within it. A local non-elevated user could replace the user-writable VM bundle directory with a directory junction pointing to an attacker-chosen location, causing the service to create a SYSTEM-owned file in an arbitrary directory. This could be leveraged for local privilege escalation. This vulnerability is fixed in 1.3834.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00156 4th percentileScored 2026-11-07
Fix Fixed claude-code (anthropics): 1.3834.0

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

VendorProductAffected versionsFixed inStatusSource
anthropicsclaude-codebefore 1.3834.01.3834.0Patch availableCNA
  • claude-code Vendoranthropics Affected before 1.3834.0 Fixed in 1.3834.0 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:anthropic:claude_desktop:*:*:*:*:*:*:*:*before 1.3834.0Vulnerableanthropics
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*not specified by NVDRunning onMicrosoft
  • cpe:2.3:a:anthropic:claude_desktop:*:*:*:*:*:*:*:* Versions before 1.3834.0 Vulnerable ·anthropics
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft

Remediation

  • Fix · CNA claude-code (anthropics) Fixed in 1.3834.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44470

References

Advisory 1

  • TI-2026-32406 Claude Desktop: SSH Host Key Verification Bypass Allows Man-in-the-Middle Attack on Remote Sessions CVSS 4.0HIGH 7.4

Sources

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