show_cracked_hashes

THE RISK

Low Risk

Why show_cracked_hashes needs a policy

This tool retrieves historical password cracking results from a potfile (Hashcat's cache of previously cracked hashes and plaintext passwords). It is a read-only operation that queries existing data.

From the tool's definition Tool name and description indicate it 'Show[s] previously cracked hashes from potfile' — a retrieval operation with no modification or side effects.

Documented attack patterns abuse exactly the kind of access show_cracked_hashes gives an agent:

POLICY

How to control show_cracked_hashes

PolicyLayer is an MCP gateway — it sits between your AI agents and Hashcat MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for show_cracked_hashes:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "show_cracked_hashes": {}
  }
}

show_cracked_hashes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Hashcat MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Hashcat MCP Server tools

Execute auto_attack_strategy Automatically choose and execute best attack strategy Execute benchmark_hashcat Run hashcat benchmark for specified hash types or all types Execute crack_hash Crack a hash using hashcat with various attack modes Execute crack_multiple_hashes Crack multiple hashes efficiently with auto-detection Execute create_wordlist_rules Generate wordlist variations using hashcat rules Execute generate_mask_attack Generate mask attack patterns for brute force Execute generate_smart_masks Generate intelligent mask patterns based on common password patterns Write create_session Create a new hashcat session for tracking

All 23 Hashcat MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about show_cracked_hashes

What does the show_cracked_hashes tool do? +

Show previously cracked hashes from potfile. It is categorised as a Read tool in the Hashcat MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on show_cracked_hashes? +

Register the Hashcat MCP Server MCP server in PolicyLayer and add a rule for show_cracked_hashes: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Hashcat MCP Server. Nothing to install.

What risk level is show_cracked_hashes? +

show_cracked_hashes is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit show_cracked_hashes? +

Yes. Add a rate_limit block to the show_cracked_hashes rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block show_cracked_hashes completely? +

Set action: deny in the PolicyLayer policy for show_cracked_hashes. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides show_cracked_hashes? +

show_cracked_hashes is provided by the Hashcat MCP Server MCP server (mordavid/hashcat-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Hashcat MCP Server tool call.

Start from Hashcat MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →