{"id":"CVE-2026-85661","summary":"excel-mcp-server 0.1.8 Arbitrary File Read/Write via stdio mode","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.","modified":"2026-09-06T03:47:20.828927885Z","published":"2026-09-04T14:32:18.828Z","database_specific":{"cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85661.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85661.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85661"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/excel-mcp-server-0.1.8-arbitrary-file-read-write-via-stdio-mode"},{"type":"REPORT","url":"https://github.com/haris-musa/excel-mcp-server/issues/149"},{"type":"PACKAGE","url":"https://github.com/haris-musa/excel-mcp-server"},{"type":"ARTICLE","url":"https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/server.py"},{"type":"ARTICLE","url":"https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/validation.py"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/haris-musa/excel-mcp-server","events":[{"introduced":"0"},{"last_affected":"f51340ecd5778952405044b203d3a2d4c8a46833"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0.1.8"}],"source":"AFFECTED_FIELD"}}],"versions":["v0.1.8","v0.1.7","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85661.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}