Is this vulnerability remotely exploitable?

Yes, if the filesystem MCP server is exposed to remote clients or integrated into a system where untrusted or semi-trusted users can invoke the read_content tool and control the path arguments, they can potentially read files outside the intended directory.

What level of access does an attacker need?

The attacker needs the ability to call read_content with controllable paths inside the configured allowed directory. Exploitation becomes straightforward if they can also create or manage symlinks in that directory; in some deployments, that may be possible through normal application workflows or other write mechanisms.

What is the safest general fix pattern?

Use canonical path resolution before access, and only proceed with file reads when the fully resolved path remains under the designated base directory. The path-checking logic should be centralized, operate on resolved paths, and be applied consistently to all file operations exposed by the MCP server.

Severity:

HIGH RISK

(7.5)

Path Traversal via Symlink Abuse (CWE-23) in @sylphxltd/filesystem-mcp read_content Tool

CVE-2025-67366

Published:

Jan 7, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

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Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Path Traversal

CWE:

CWE-23

Impact:

Unauthorized File Read / Directory Traversal

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal

CWE:

CWE-23

Impact:

Unauthorized File Read / Directory Traversal

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Path Traversal via Symlink Abuse (CWE-23) in @sylphxltd/filesystem-mcp read_content Tool

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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