Path Traversal Vulnerability in ishayoyo Excel-MCP - Affected Product by ishayoyo
CVE-2026-10278

5.3MEDIUM

Key Information:

Vendor

Ishayoyo

Status
Excel-mcp
Vendor
CVE Published:
1 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-10278?

A path traversal vulnerability exists in the ishayoyo Excel-MCP component, specifically in the read_file/write_file feature located in src/index.ts, exposing it to potential unauthorized access to filesystem locations. By manipulating the filePath or outputPath arguments, an attacker can exploit this flaw remotely. The vulnerability has been publicly disclosed, and despite prior notification to the developers, no remediation steps have been undertaken yet.

Affected Version(s)

excel-mcp 1.0.0

excel-mcp 1.0.1

excel-mcp 1.0.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-10278 - Proof of Concept

References

https://vuldb.com/vuln/367571
vdb-entrytechnical-description
https://vuldb.com/vuln/367571/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-10278
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ccccccctfi (VulDB User)
VulDB CNA Team
.