CVE-2026-40576
CriticalSummary
W excel-mcp-server, który jest serwerem Model Context Protocol do manipulacji plikami Excel, występuje podatność na traversję ścieżki w wersjach do 0.1.7. Atakujący bez uwierzytelnienia może zdalnie odczytywać, zapisywać i nadpisywać dowolne pliki na systemie plików hosta, wykorzystując odpowiednio skonstruowane argumenty ścieżki.
Risk Assessment
Podatność ta stwarza poważne ryzyko dla organizacji, umożliwiając atakującym zdalny dostęp do plików systemowych, co może prowadzić do utraty danych lub kompromitacji systemu.
Recommendation
Zaleca się aktualizację excel-mcp-server do najnowszej wersji, która naprawia tę podatność oraz ograniczenie dostępu do serwera tylko do zaufanych sieci i użytkowników.
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Original NVD description (English source)
excel-mcp-server is a Model Context Protocol server for Excel file manipulation. A path traversal vulnerability exists in excel-mcp-server versions up to and including 0.1.7. When running in SSE or Streamable-HTTP transport mode (the documented way to use this server remotely), an unauthenticated attacker on the network can read, write, and overwrite arbitrary files on the host filesystem by supplying crafted filepath arguments to any of the 25 exposed MCP tool handlers. The server is intended to confine file operations to a directory set by the EXCEL_FILES_PATH environment variable. The function responsible for enforcing this boundary — get_excel_path() — fails to do so due to two independent flaws: it passes absolute paths through without any check, and it joins relative paths without resolving or validating the result. Combined with zero authentication on the default network-facing transport and a default bind address of 0.0.0.0 (all interfaces), this allows trivial remote exploitat
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

