corscanner · PenTest MCP Server MCP: Risk & Policy

WHAT IT DOES

What corscanner does on PenTest MCP Server

AI agents invoke corscanner to trigger actions in PenTest MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why corscanner needs a policy

CORScanner actively probes remote targets by sending crafted HTTP requests to detect CORS misconfigurations. This is an external operation whose effects depend on arguments (target URL/domain). On a pentest server context, misuse could mean scanning unauthorized targets, constituting unauthorized access attempts. Severity is high given the offensive security context and potential for abuse against external systems.

From the tool's definition CORS misconfiguration scanner — runs an active scanning tool against a target to detect CORS misconfigurations, part of a penetration testing server with 30+ security tools

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

corscanner Rate-limited

corscanner stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "corscanner": {
      "limits": [
        {
          "counter": "corscanner_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about corscanner

What does the corscanner tool do? +

CORS misconfiguration scanner. It is categorised as a Execute tool in the PenTest MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on corscanner? +

Register the PenTest MCP Server MCP server in PolicyLayer and add a rule for corscanner: 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 PenTest MCP Server. Nothing to install.

What risk level is corscanner? +

corscanner is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit corscanner? +

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

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

corscanner is provided by the PenTest MCP Server MCP server (mohitsahoo/mcptoolforwebvulnerabilities-). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.