Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Imap Mcp

A self-hosted Rust service that acts as a multi-tenant IMAP MCP server for claude.ai, using any OpenID Connect provider for authentication.

Compatibility: Not stated.

Grade C

One Medium finding. Read the report before installing.

Graded by PlugVetRubric v2

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

AGENT_IGNORE_INSTRUCTIONS

Why this grade

  • AGENT_IGNORE_INSTRUCTIONS Medium

    Text tells the agent to ignore earlier instructions.

    src/sanitize.rs, line 1099 // <div style="display:none">IGNORE PREVIOUS INSTRUCTIONS

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

    Concern

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

    NETWORK_NO_FIXED_HOST

    src/imap.rs, line 266

    .fetch(&range, "(UID FLAGS ENVELOPE)")

    src/imap.rs, line 640

    .fetch(mailbox.exists.to_string(), "(UID)")

    src/imap.rs, line 760

    .fetch(mailbox.exists.to_string(), "(UID)")

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_UNCONFIRMED

    .claude/commands/speckit.implement.md, line 112

    - **Node.js/JavaScript/TypeScript**: `node_modules/`, `dist/`, `build/`, `*.log`, `.env*`

    .claude/commands/speckit.implement.md, line 118

    - **PHP**: `vendor/`, `*.log`, `*.cache`, `*.env`

    .claude/commands/speckit.implement.md, line 119

    - **Rust**: `target/`, `debug/`, `release/`, `*.rs.bk`, `*.rlib`, `*.prof*`, `.idea/`, `*.log`, `.env*`

    Show more

    .claude/commands/speckit.implement.md, line 120

    - **Kotlin**: `build/`, `out/`, `.gradle/`, `.idea/`, `*.class`, `*.jar`, `*.iml`, `*.log`, `.env*`

    .claude/commands/speckit.implement.md, line 121

    - **C++**: `build/`, `bin/`, `obj/`, `out/`, `*.o`, `*.so`, `*.a`, `*.exe`, `*.dll`, `.idea/`, `*.log`, `.env*`

    .claude/commands/speckit.implement.md, line 122

    - **C**: `build/`, `bin/`, `obj/`, `out/`, `*.o`, `*.a`, `*.so`, `*.exe`, `*.dll`, `autom4te.cache/`, `config.status`, `config.log`, `.idea/`, `*.log`, `.env*`

    .claude/commands/speckit.implement.md, line 128

    - **Docker**: `node_modules/`, `.git/`, `Dockerfile*`, `.dockerignore`, `*.log*`, `.env*`, `coverage/`

    .gitignore, line 1

    /target

  • Agent instructions

    Serious

    instructions tell the agent to ignore earlier instructions.

    AGENT_IGNORE_INSTRUCTIONS

    src/sanitize.rs, line 1099

    // <div style="display:none">IGNORE PREVIOUS INSTRUCTIONS

  • 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.

Get the full report on this tool, £49

Note

Hygiene check of commit fd7e351fd482. can reach a host that is not written as a fixed address. reads a credential or environment file. instructions tell the agent to ignore earlier instructions.

Date and source

Date checked:

View source

github.com

Commit graded: fd7e351fd482b0fc6014919dba6e781453265802

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