Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Public Browser

Lets Claude Code, Cursor and any MCP client drive Chrome.

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.

Rescanned at commit cff6e47d5217, unchanged since the check below.

OBFUSCATION_ENCODED_BLOB

Why this grade

  • OBFUSCATION_ENCODED_BLOB Medium

    Contains a long base64 shaped string in a file that should be readable.

    src/registry.test.ts, line 1 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";

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

    Note

    requests shell access. The manifest names this permission.

    PERMISSION_SHELL_DECLARED

    python/publicbrowser/client.py, line 84

    self._server_proc: subprocess.Popen[bytes] | None = None

    python/publicbrowser/client.py, line 239

    self._server_proc = subprocess.Popen(

    scripts/publish.test.ts, line 4

    * Mocks child_process.execFileSync and fs functions - no real CLI calls.

  • Install and update

    Pass

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

  • Network

    Concern

    can reach a host that is not written as a fixed address.

    NETWORK_NO_FIXED_HOST

    python/publicbrowser/client.py, line 133

    with urllib.request.urlopen(req, timeout=timeout) as resp:

    python/publicbrowser/client.py, line 427

    with urllib.request.urlopen(req, timeout=timeout) as resp:

    src/registry.ts, line 1850

    ssList), shadow-root traversal, in-page fetch(), app-specific side effects no dedicate

    Show more

    src/tools/evaluate.test.ts, line 608

    const code = `const { data } = await fetch('/api').then(r => r.json());\ndata;`;

    src/tools/evaluate.test.ts, line 615

    const code = `const [a, b] = await Promise.all([fetch('/a'), fetch('/b')]);\n[a, b];`;

    src/tools/evaluate.test.ts, line 621

    const code = `const x = (await fetch('/api')).status;\nx;`;

    src/tools/evaluate.test.ts, line 843

    "fetch('/api/data', { credentials: '

    src/tools/evaluate.test.ts, line 852

    "fetch(url, { headers: { 'x-apple-xsrf-token': token } })",

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_DOTENV

    test-hardest/blind-run.mjs, line 727

    const sessionEnv = isCli ? { ...childEnv, ...env, PATH: `${cliBinDir}:${childEnv.PATH ?? ''}` } : childEnv;

    test-hardest/blind-run.test.mjs, line 117

    const env = PARTICIPANTS['public-browser'].env(rundir);

    test-hardest/blind-run.test.mjs, line 700

    assert.equal(mcp.mcpServers['fake'].env.SILBERCUE_CHROME_HEADLESS, '1');

    Show more

    test-hardest/blind-run.test.mjs, line 714

    assert.equal(mcp.mcpServers['fake'].env.SILBERCUE_CHROME_HEADLESS, undefined);

    test-hardest/blind-run.test.mjs, line 724

    assert.equal(mcp.mcpServers['fake'].env.SILBERCUE_CHROME_HEADLESS, undefined);

    test-hardest/fixtures/blind-run/fake-claude.mjs, line 71

    OPENAI_API_KEY: process.env.OPENAI_API_KEY ?? null }));

    .gitignore, line 25

    # Environment / secrets

    .gitignore, line 26

    .env

    .gitignore, line 27

    .env.local

  • Agent instructions

    Pass

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

  • Obfuscation

    Concern

    contains an encoded blob in a file that should be readable.

    OBFUSCATION_ENCODED_BLOB

    src/registry.test.ts, line 1

    import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";

    src/cache/a11y-tree.test.ts, line 1

    import { describe, it, expect, vi, beforeEach } from "vitest";

    src/overlay/session-overlay.ts, line 6

    "iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAIAAADYYG7QAAAAAXNSR0IArs4c6QAAAERlWElmTU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAAAMKADAAQAAAABAAAAMAAAAADbN2wMAAADOElEQVR

  • 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 cff6e47d5217. requests shell access. The manifest names this permission. can reach a host that is not written as a fixed address. reads a credential or environment file. contains an encoded blob in a file that should be readable.

Date and source

Date checked:

View source

github.com

Commit graded: cff6e47d521769cecaa81592fa2d7f032cfa65ac

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