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archive/Patch now/AIR-2026-1044
closedclosed 21 Apr 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-40576: Path traversal in excel-mcp-server

excel-mcp-server

A path traversal vulnerability affects excel-mcp-server versions up to 0.1.7 when running in SSE or HTTP transport modes. Unauthenticated network attackers can read and write arbitrary files on the host filesystem via tool handlers.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
9.4
EPSS
<0.01 · top 60% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
21 Apr 2026
last update
21 Apr 2026
CVE ids
CVE-2026-40576other records

Timeline · 1

  1. 21 Apr 2026CVE-2026-40576: excel-mcp-server is a Model Context Protocol server for Excel file manipulation.

Sources · 1

Advisories and databases

  1. 2026-04-21
    CVE-2026-40576: excel-mcp-server is a Model Context Protocol server for Excel file manipulation.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-40576

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
path-traversalmcp-server
dates
happened 21 Apr 2026 · first reported 21 Apr 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-40576: Path traversal in excel-mcp-server

https://gcdradar.vercel.app/incidents/cve-2026-40576-path-traversal-in-excel-mcp-server · AIR-2026-1044 · closed 2026-04-21

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-04-21
- AI role: Attack on AI
- Products: excel-mcp-server
- CVE ids: CVE-2026-40576
- CVSS: 9.4

## Summary

A path traversal vulnerability affects excel-mcp-server versions up to 0.1.7 when running in SSE or HTTP transport modes. Unauthenticated network attackers can read and write arbitrary files on the host filesystem via tool handlers.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-04-21: CVE-2026-40576: excel-mcp-server is a Model Context Protocol server for Excel file manipulation. (https://nvd.nist.gov/vuln/detail/CVE-2026-40576)

## Sources

- 2026-04-21 NVD: CVE-2026-40576: excel-mcp-server is a Model Context Protocol server for Excel file manipulation. https://nvd.nist.gov/vuln/detail/CVE-2026-40576

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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