## Summary Harden input handling in `src/server/index.ts` (flagged by multi_agent_ai). ## Vulnerability | Field | Value | |-------|-------| | **ID** | V-002 | | **Severity** | HIGH | | **Scanner** | multi_agent_ai | | **Rule** | `V-002` | | **File** | `src/server/index.ts:1` | | **Assessment** | Defensive hardening | | **CWE** | CWE-79 | **Description**: The Express application does not have helmet middleware or equivalent security headers configured. Without Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, and HSTS headers, the application is vulnerable to XSS, clickjacking, and MIME type confusion attacks. ## Threat Model Context This is a web service - vulnerabilities in request handlers are directly exploitable by remote attackers. ## Changes - `package.json` - `src/server/index.ts` ## Behavior Preservation The change is scoped to 2 files on the vulnerable path. ## Security Invariant > **Property**: User-supplied strings in HTTP responses are HTML-escaped

Regression test

```typescript import { expect } from "chai"; import express from "express"; import request from "supertest"; describe("User-supplied strings in HTTP responses are HTML-escaped", () => { const payloads = [ "", "

", "normal text", ]; it("escapes XSS payloads in response body", async () => { const app = express(); app.use(express.json()); app.get("/test", (req, res) => { const userInput = req.query.input as string; res.send(`

${userInput}

`); }); for (const payload of payloads) { const response = await request(app).get(`/test?input=${encodeURIComponent(payload)}`); expect(response.status).to.equal(200); expect(response.headers["content-type"]).to.include("text/html"); expect(response.text).to.not.include("

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