CVE-2026-85661excel-mcp-server 0.1.8 Arbitrary File Read/Write via stdio mode
Updated under an hour ago ()
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It affects haris-musa excel-mcp-server. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-22
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
haris-musa excel-mcp-server haris_musa:excel_mcp_server (from the name) | through 0.1.8 | CNA record |
References
- https://github.com/haris-musa/excel-mcp-server/issues/149issue-tracking
- https://github.com/haris-musa/excel-mcp-serverproduct
- https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/server.pytechnical-description
- https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/validation.pytechnical-description
- https://www.vulncheck.com/advisories/excel-mcp-server-0.1.8-arbitrary-file-read-write-via-stdio-modethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.