{"id":"CVE-2026-85661","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-85661","summary":"excel-mcp-server 0.1.8 fails to enforce path confinement in stdio mode when EXCEL_FILES_PATH is unset, allowing attackers to read and write arbitrary files. Attackers can supply unchecked…","details":"excel-mcp-server 0.1.8 fails to enforce path confinement in stdio mode when EXCEL_FILES_PATH is unset, allowing attackers to read and write arbitrary files. Attackers can supply unchecked file paths to read and write tools to access any file accessible to the process.","published":"2026-09-04T15:17:43.643","modified":"2026-09-04T15:17:43.643","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/haris-musa/excel-mcp-server"},{"type":"WEB","url":"https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/server.py"},{"type":"WEB","url":"https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/validation.py"},{"type":"WEB","url":"https://github.com/haris-musa/excel-mcp-server/issues/149"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/excel-mcp-server-0.1.8-arbitrary-file-read-write-via-stdio-mode"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-04T15:17:43.643"}}