This record as markdown: /tools/seac-25-kali-security-mcp/browser-execute-js.md
What browser_execute_js does on Kali Security MCP
AI agents invoke browser_execute_js to trigger actions in Kali Security MCP. 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 browser_execute_js is rated High
This tool runs JavaScript code with effects that depend entirely on the arguments provided. In the context of a penetration testing framework (Kali Security MCP), executing arbitrary JavaScript in a browser can trigger malicious actions, steal credentials, modify page content, or perform unauthorized operations.
From the tool's definition Tool name contains 'execute_js' and description states '在浏览器上下文中执行JavaScript代码' (execute JavaScript code in browser context). This directly executes arbitrary code in a browser environment.
Attacks that exploit this kind of access
The rule that runs browser_execute_js safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Kali Security MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browser_execute_js, this is the rule to start with:
browser_execute_js 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Kali Security MCP, apply this rule, and every browser_execute_js call is checked against it from then on.
Questions about browser_execute_js
在浏览器上下文中执行JavaScript代码. It is categorised as a Execute tool in the Kali Security MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Kali Security MCP server in PolicyLayer and add a rule for browser_execute_js: 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 Kali Security MCP. Nothing to install.
browser_execute_js is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the browser_execute_js 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.
Set action: deny in the PolicyLayer policy for browser_execute_js. 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.
browser_execute_js is provided by the Kali Security MCP server (seac-25/kali-security-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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