Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Ghost

Verified control of the whole desktop for agents on Windows and Linux: apps with no API, windows, shell, browser.

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 f966463dcd98, unchanged since the check below.

INSTALL_REMOTE_SCRIPT

Why this grade

  • INSTALL_REMOTE_SCRIPT Medium

    Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).

    .github/workflows/linux.yml, line 163 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal

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.

If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.

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

    bench/run_bench.py, line 45

    self.p = subprocess.Popen(

    crates/ghost-session/src/shell.rs, line 9

    //! stdin, `Invoke-Expression`s the decoded command with stderr merged, then emits

    crates/ghost-session/src/shell.rs, line 228

    try{$o=Invoke-Expression $cmd 2>&1|Out-String;[Console]::Out.Write($o)}catch{[Console]::Out.Write(($_|Out-String))}

    Show more

    examples/background_agent_demo.py, line 29

    self.p = subprocess.Popen([exe], stdin=subprocess.PIPE, stdout=subprocess.PIPE,

    examples/live_showcase.py, line 21

    self.p = subprocess.Popen([exe], stdin=subprocess.PIPE, stdout=subprocess.PIPE,

    ghost-agent/agent.py, line 24

    proc = subprocess.Popen(

    kit/recipes/_ghost.py, line 40

    self.p = subprocess.Popen(

    docs/plans/2026-04-17-http-agent.md, line 187

    proc = subprocess.Popen([EXE], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)

  • Install and update

    Serious

    install fetches a script from the network.

    INSTALL_REMOTE_SCRIPT

    .github/workflows/linux.yml, line 163

    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal

  • Network

    Concern

    can reach a host that is not written as a fixed address. can reach evil. The description does not name that host.

    NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST

    crates/ghost-browser/src/tab.rs, line 102

    /// `awaitPromise` is on so callers can evaluate `fetch(...).then(r => r.text())`

    crates/ghost-browser/src/tab.rs, line 777

    let hostile = r#"a"); fetch("http://evil"); ("#;

    crates/ghost-http/src/main.rs, line 5

    //! curl -X POST http://127.0.0.1:7878/click -d '{"name":"Submit"}' -H "content-type: application/json"

    Show more

    crates/ghost-http/src/main.rs, line 6

    //! curl http://127.0.0.1:7878/list-windows

    crates/ghost-http/src/main.rs, line 7

    //! curl -X POST http://127.0.0.1:7878/run -d @intent.json -H "content-type: application/json"

    crates/ghost-http/src/main.rs, line 317

    // machine to POST to ghost-http via fetch() (localhost CSRF). Callers are curl/local

    crates/ghost-http/src/main.rs, line 324

    eprintln!(" curl http://{}/tools for endpoint docs", cli.addr);

    README.md, line 406

    requests.post("http://127.0.0.1:7878/launch", json={"exe": "notepad.exe"})

    README.md, line 407

    requests.post("http://127.0.0.1:7878/type",

    README.md, line 413

    await fetch("http://127.0.0.1:7878/hotkey", {

    docs/audits/round1-confirmed.json, line 220

    "problem": "The ghost-http server adds `Access-Control-Allow-Origin: *` and allows all methods/headers via CorsLayer::permissive(). Although it binds to 127.0.0.1 (loopback), the p

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_DOTENV

    crates/ghost-session/src/vision.rs, line 375

    // Return trimmed - a trailing newline from a .env loader would

    scripts/focus-lock-probe.mjs, line 24

    const server = spawn(exe, [], { stdio: ['pipe', 'pipe', 'pipe'], env: { ...process.env, ...env } });

    scripts/shell-switch-probe.mjs, line 16

    const s = spawn(exe, [], { stdio: ['pipe', 'pipe', 'pipe'], env: { ...process.env, ...env } });

  • Agent instructions

    Pass

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

  • Obfuscation

    Note

    a file was over the read cap and was not fully read.

    OBFUSCATION_FILE_OVER_READ_CAP

    crates/ghost-mcp/src/main.rs, line 1

    #![recursion_limit = "512"]

    docs/research/2026-05-30-ghost-recon.json, line 1

    {

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

Note

Hygiene check of commit f966463dcd98. requests shell access. The manifest names this permission. install fetches a script from the network. can reach a host that is not written as a fixed address. can reach evil. The description does not name that host. reads a credential or environment file. a file was over the read cap and was not fully read.

Date and source

Date checked:

View source

github.com

Commit graded: f966463dcd983c0acbb100e9871032b35807de11

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