Command Injection Vulnerability in Efforthye Fast-Filesystem-MCP Product
CVE-2026-5327

5.3MEDIUM

Key Information:

Vendor

Efforthye

Status
Fast-filesystem-mcp
Vendor
CVE Published:
2 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5327?

A security flaw has been identified in the Efforthye Fast-Filesystem-MCP product, specifically within the 'handleGetDiskUsage' function located in the src/index.ts file. This vulnerability allows an attacker to execute arbitrary commands through manipulation, potentially leading to unauthorized access and control. The flaw can be exploited remotely and has been made public, heightening the risk of attacks. Despite being alerted about this issue via an early report, the project maintainers have yet to respond or provide a patch.

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Affected Version(s)

fast-filesystem-mcp 3.5.0

fast-filesystem-mcp 3.5.1

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-2026-5327 - Proof of Concept

References

https://vuldb.com/vuln/354658
vdb-entrytechnical-description
https://vuldb.com/vuln/354658/cti
signaturepermissions-required
https://vuldb.com/submit/780776
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

Yinci Chen (VulDB User)
VulDB CNA Team
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