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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00441.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
haris-musa excel-mcp-server unaffected
Version Status Constraints
0 affected ≤ 0.1.8

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/haris-musa/excel-mcp-server cve-icon cve-icon
https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/server.py cve-icon cve-icon
https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/validation.py cve-icon cve-icon
https://github.com/haris-musa/excel-mcp-server/issues/149 cve-icon cve-icon
https://www.vulncheck.com/advisories/excel-mcp-server-0.1.8-arbitrary-file-read-write-via-stdio-mode cve-icon cve-icon
History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Fri, 04 Sep 2026 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Haris-musa
Haris-musa excel-mcp-server
Vendors & Products Haris-musa
Haris-musa excel-mcp-server

Fri, 04 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
Description 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.
Title excel-mcp-server 0.1.8 Arbitrary File Read/Write via stdio mode
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-14T19:33:09.025Z

Reserved: 2026-09-04T13:32:27.956Z

Link: CVE-2026-85661

cve-icon Vulnrichment

Updated: 2026-09-14T19:24:18.523Z

cve-icon NVD

Status : Received

Published: 2026-09-04T15:17:43.643

Modified: 2026-09-14T20:16:59.127

Link: CVE-2026-85661

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-04T15:52:41Z

Weaknesses