Have I Been Pwned MCP Server

A Model Context Protocol (MCP) server that provides integration with the Have I Been Pwned API to check if your accounts or passwords have been compromised in data breaches.

Features

This MCP server provides four main tools:

check_email: Check if an email address has been found in data breaches
check_password: Check if a password has been exposed in data breaches (using k-anonymity)
get_breach_details: Get detailed information about a specific data breach
list_all_breaches: List all breaches in the system, optionally filtered by domain

Installation

Installing via Smithery

To install hibp-mcp-server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @Cyreslab-AI/hibp-mcp-server --client claude

Prerequisites

Node.js (v14 or higher)
npm (v6 or higher)
A Have I Been Pwned API key (get one at haveibeenpwned.com/API/Key)

Setup

Clone this repository:
git clone https://github.com/Cyreslab-AI/hibp-mcp-server.git cd hibp-mcp-server
Install dependencies:
npm install
Build the server:
npm run build
Configure the server in your MCP settings file:For Claude VSCode extension, add to ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json:
{ "mcpServers": { "hibp": { "command": "node", "args": ["/path/to/hibp-mcp-server/build/index.js"], "env": { "HIBP_API_KEY": "YOUR_API_KEY_HERE" }, "disabled": false, "autoApprove": [] } } }
For Claude desktop app, add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or similar path on other platforms.

Usage Examples

Once the server is configured, you can use it with Claude to check for data breaches:

Check Email

User: Has my email address example@gmail.com been pwned?

Claude: Good news! This email address has not been found in any known data breaches.

Or if the email was found in breaches:

User: Has my email address breached@example.com been pwned?

Claude: ⚠️ This email address was found in 3 data breaches.

Breach details:

1. Adobe (2013-10-04)
   Domain: adobe.com
   Description: In October 2013, 153 million Adobe accounts were breached...
   Compromised data: Email addresses, Password hints, Passwords, Usernames

2. LinkedIn (2012-05-05)
   Domain: linkedin.com
   Description: In May 2016, LinkedIn had 164 million email addresses and passwords exposed...
   Compromised data: Email addresses, Passwords

3. Dropbox (2012-07-01)
   Domain: dropbox.com
   Description: In mid-2012, Dropbox suffered a data breach which exposed...
   Compromised data: Email addresses, Passwords

Recommendations:
- Change your password for these services immediately
- If you used the same password elsewhere, change those too
- Enable two-factor authentication where available
- Consider using a password manager

Check Password

User: Has the password "password123" been exposed in any breaches?

Claude: ⚠️ This password has been exposed in data breaches 123,456 times!

Recommendations:
- Stop using this password immediately
- Change it on any site where you use it
- Use a unique, strong password for each account
- Consider using a password manager

Get Breach Details

User: Tell me about the LinkedIn data breach

Claude: # LinkedIn Data Breach

**Date:** 2012-05-05
**Domain:** linkedin.com
**Accounts affected:** 164,611,595
**Verified:** Yes
**Data leaked:** Email addresses, Passwords

**Description:**
In May 2016, LinkedIn had 164 million email addresses and passwords exposed. Originally hacked in 2012, the data remained out of sight until being offered for sale on a dark market site 4 years later. The passwords in the breach were stored as SHA1 hashes without salt, the vast majority of which were quickly cracked in the days following the release of the data.

**Recommendations:**
- If you had an account on this service, change your password
- If you used the same password elsewhere, change those too
- Monitor your accounts for suspicious activity
- Be cautious of phishing attempts that may use this leaked information

List All Breaches

User: List all Adobe data breaches

Claude: Found 1 breaches for domain adobe.com:

1. Adobe (2013-10-04)
   Domain: adobe.com
   Accounts affected: 152,445,165
   Compromised data: Email addresses, Password hints, Passwords, Usernames

Security Notes

The password checking feature uses k-anonymity to check passwords without sending the full password to the Have I Been Pwned API
Only the first 5 characters of the SHA-1 hash of the password are sent to the API
The API returns a list of hash suffixes that match the prefix, and the check is completed locally

API Key Configuration

This server requires a Have I Been Pwned API key to function for most features (except password checking). You can get an API key at haveibeenpwned.com/API/Key.

The API key should be provided as an environment variable named HIBP_API_KEY in your MCP settings configuration.

License

MIT

Install Server

HTTP connection URL

security – no known vulnerabilities

license - permissive license

quality - confirmed to work

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Tools

A Model Context Protocol (MCP) server that provides integration with the Have I Been Pwned API to check if your accounts or passwords have been compromised in data breaches.

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