MCP Risk

Directory / server

@modelcontextprotocol/server-filesystem

This directory entry reports an automated security scan of @modelcontextprotocol/server-filesystem, scanned 2026-07-26. Trust grade B rates provenance, transport, known vulnerabilities and instruction integrity; capability risk is reported separately, not folded into the grade.

registry.modelcontextprotocol.io, scanned 2026-07-26, tool surface via package-source

B 81/100 permalink

Automated checks

StatusCheckPolicyResult
WARN Listed on the official MCP registry §1.1

Not found on the official MCP registry. Not disqualifying, but listed servers carry namespace-verified provenance.
PASS Source repository is public and maintained §1.2
Active repository with a license. 5 findings
  • Repository ↗
  • Last push: 0 days ago
  • Stars: 88895
  • License: NOASSERTION
  • Security policy (SECURITY.md): absent
PASS Published package is consistent and attested §1.3
Package is consistent with its source and carries provenance attestation. 6 findings
  • Package: @modelcontextprotocol/server-filesystem@2026.7.10 ↗
  • Ecosystem: npm
  • Age: 611 days
  • Weekly downloads: 471726
  • Repo field matches source repo: true
  • Build-provenance attestation: present
PASS Tool surface is inspectable and proportionate §2.1–§2.4
Package source scanned. Capabilities detected: filesystem. Reported as capability risk (§2.4); whether each is essential to the server's stated purpose is §2.3 and remains a manual judgement. 5 findings
  • filesystem (filesystem write/delete): dist/index.js
  • filesystem (fs module import): dist/index.js
  • filesystem (filesystem write/delete): dist/roots-utils.js
  • filesystem (fs module import): dist/roots-utils.js
  • Detected capabilities: filesystem
INFO Transport & authentication §3

Local (stdio) server: runs with host-process privileges by design. Transport checks apply to remote servers; scrutiny shifts to §1/§2.
FAIL No known vulnerabilities (OSV.dev) §4.1
2 advisory(ies) on record for @modelcontextprotocol/server-filesystem @2026.7.10 (npm) - review whether the evaluated version is affected. 2 findings
  • GHSA-hc55-p739-j48w: @modelcontextprotocol/server-filesystem vulnerability allows for path validation bypass via colliding path prefix ↗
  • GHSA-q66q-fx2p-7w4m: @modelcontextprotocol/server-filesystem allows for path validation bypass via prefix matching and symlink handling ↗
PASS Server-supplied instructions free of poisoning indicators §5.1–§5.4

No poisoning indicators found across 14 server-supplied text item(s).

Score history

DateGradeScore
2026-07-26B81/100
2026-07-25D59/100
2026-07-12D59/100
What this grade covers
  • Provenance & supply-chain integrity (§1)
  • Tool surface & capability risk (§2)
  • Transport & authentication (§3)
  • Known CVEs via OSV.dev (§4)
  • Instruction/tool poisoning patterns (§5)

Limitations: pattern-based only (no semantic injection detection), static npm analysis (live server instructions not retrieved for package-only scans), single-server scope (no cross-server toxic flow analysis). See the full policy.

Methodology: MCP Server Security Policy. Unfamiliar term? See the glossary.