CVE-2026-44470

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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."}, {"lang": "es", "value": "La aplicaci\u00f3n de escritorio Claude le ofrece Claude Code con una interfaz gr\u00e1fica dise\u00f1ada para ejecutar m\u00faltiples sesiones en paralelo. Antes de la versi\u00f3n 1.3834.0, el componente CoworkVMService en Claude Desktop para Windows se ejecutaba como SYSTEM y no validaba si el directorio del paquete de la VM era un directorio real o una uni\u00f3n de directorio NTFS antes de crear archivos dentro de \u00e9l. Un usuario local sin privilegios elevados podr\u00eda reemplazar el directorio del paquete de la VM escribible por el usuario con una uni\u00f3n de directorio que apuntaba a una ubicaci\u00f3n elegida por el atacante, lo que provocaba que el servicio creara un archivo propiedad de SYSTEM en un directorio arbitrario. Esto podr\u00eda ser aprovechado para una escalada de privilegios local. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 1.3834.0."}], "lastModified": "2026-10-26T14:10:00.130", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:anthropic:claude_desktop:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5124670B-FD73-4EEF-B494-6CD3DDFC73A4", "versionEndExcluding": "1.3834.0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "security-advisories@github.com"}