Grades are a hygiene check, not a security guarantee.

MCP, MCP server

MCP Browser

A native macOS web browser that exposes itself as a Model Context Protocol server, so AI agents can drive a real WKWebView the same way a person would — navigate, click, fill forms, read the DOM, take screenshots, run JavaScript, and capture ne

Compatibility: Not stated.

Grade C

One Medium finding. Read the findings before installing.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

NETWORK_HOST_FROM_INPUT

Why this grade

  • NETWORK_HOST_FROM_INPUT Medium

    A file takes a URL or endpoint as input and has no fixed host list.

    MCP Browser/Storage/ActionLog.swift, line 72 const r = await fetch(endpoint, {

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Pass

    No shell or command execution found, and no extra permission was declared.

  • Install and update

    Pass

    No install-time script found, and dependencies are pinned or absent.

  • Network

    Serious

    accepts a host from input, with no fixed list in this file.

    NETWORK_HOST_FROM_INPUT

    MCP Browser/Storage/ActionLog.swift, line 72

    const r = await fetch(endpoint, {

    MCP Browser/Storage/FaviconService.swift, line 72

    Task { await fetch(host: host) }

    MCP Browser/Storage/FaviconService.swift, line 83

    private func fetch(host: String) async {

    Show more

    MCP Browser/Storage/Recorder.swift, line 98

    const r = await fetch(endpoint, {

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_DOTENV

    .gitignore, line 76

    # Environment / Secrets

    .gitignore, line 77

    .env

    .gitignore, line 79

    !.env.example

    Show more

    .gitignore, line 80

    *.env.local

  • Agent instructions

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Pass

    No encoded or minified payload found.

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit 90d9a05a463b. accepts a host from input, with no fixed list in this file. reads a credential or environment file.

Date and source

Date checked:

View source

github.com

Commit graded: 90d9a05a463b4d3488ab570c85011db83dc314c3

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen