misp_update_event · Misp MCP: Risk & Policy

WHAT IT DOES

What misp_update_event does on Misp

AI agents use misp_update_event to create or update resources in Misp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Misp environment.

WHY IT NEEDS A POLICY

Why misp_update_event needs a policy

This tool modifies threat intelligence data in MISP by updating event records. While updates are reversible (can be undone or corrected), they affect a shared threat intelligence platform used by the security community. The blast radius is medium because incorrect updates could propagate bad intelligence to other MISP users, but the changes are not destructive/permanent and no financial or code execution is involved.

From the tool's definition Tool name and description: 'misp_update_event' enables updating an existing MISP event. Update operations modify data in a reversible manner without permanent deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

misp_update_event Rate-limited

misp_update_event stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "misp_update_event": {
      "limits": [
        {
          "counter": "misp_update_event_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Misp, so you can run agents against it safely.

FAQ

Questions about misp_update_event

What does the misp_update_event tool do? +

Update an existing MISP event. It is categorised as a Write tool in the Misp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on misp_update_event? +

Register the Misp MCP server in PolicyLayer and add a rule for misp_update_event: 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 Misp. Nothing to install.

What risk level is misp_update_event? +

misp_update_event is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit misp_update_event? +

Yes. Add a rate_limit block to the misp_update_event 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 misp_update_event completely? +

Set action: deny in the PolicyLayer policy for misp_update_event. 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 misp_update_event? +

misp_update_event is provided by the Misp MCP server (solomonneas/misp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.