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CVE-2026-44470— Claude Desktop: Local Privilege Escalation via Directory Junction in CoworkVMService

Quick assessment

Affected
anthropics claude-code
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Claude Code是Anthropic开源的一个终端原生AI编程工具。 Claude Code 1.3834.0之前版本存在后置链接漏洞，该漏洞源于CoworkVMService组件以SYSTEM权限运行且未验证VM捆绑目录是否为真实目录或NTFS目录连接点，可能导致本地非提升用户替换可写VM捆绑目录为指向攻击者选择位置的目录连接点，从而在任意目录创建SYSTEM拥有的文件，实现本地权限提升。

AI Predicted 7.8 Difficulty: Easy EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1548.002 · Bypass User Account Control

Affected Version Matrix 1

VendorProduct Version RangeStatus
anthropics claude-code < 1.3834.0 affected
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I. Basic Information for CVE-2026-44470

Vulnerability Information
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Vulnerability Title
Claude Desktop: Local Privilege Escalation via Directory Junction in CoworkVMService
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Claude Code 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Claude Code是Anthropic开源的一个终端原生AI编程工具。 Claude Code 1.3834.0之前版本存在后置链接漏洞，该漏洞源于CoworkVMService组件以SYSTEM权限运行且未验证VM捆绑目录是否为真实目录或NTFS目录连接点，可能导致本地非提升用户替换可写VM捆绑目录为指向攻击者选择位置的目录连接点，从而在任意目录创建SYSTEM拥有的文件，实现本地权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
anthropics claude-code < 1.3834.0 -

II. Public POCs for CVE-2026-44470

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III. Intelligence Information for CVE-2026-44470

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Vendor Advisories for CVE-2026-44470 (1)

IV. Related Vulnerabilities

Same product: claude-code
Same vendor: anthropics
Same weakness: CWE-59

V. Comments for CVE-2026-44470

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