diff --git a/src/gateway/control-ui.ts b/src/gateway/control-ui.ts
index 4484bf26e52..527fc889a27 100644
--- a/src/gateway/control-ui.ts
+++ b/src/gateway/control-ui.ts
@@ -12,6 +12,7 @@ import {
 } from "./control-ui-shared.js";
 
 const ROOT_PREFIX = "/";
+const CONTROL_UI_BOOTSTRAP_CONFIG_PATH = "/__openclaw/control-ui-config.json";
 
 export type ControlUiRequestOptions = {
   basePath?: string;
@@ -68,8 +69,24 @@ type ControlUiAvatarMeta = {
 
 function applyControlUiSecurityHeaders(res: ServerResponse) {
   res.setHeader("X-Frame-Options", "DENY");
-  res.setHeader("Content-Security-Policy", "frame-ancestors 'none'");
+  // Control UI: block framing, block inline scripts, keep styles permissive
+  // (UI uses a lot of inline style attributes in templates).
+  res.setHeader(
+    "Content-Security-Policy",
+    [
+      "default-src 'self'",
+      "base-uri 'none'",
+      "object-src 'none'",
+      "frame-ancestors 'none'",
+      "script-src 'self'",
+      "style-src 'self' 'unsafe-inline'",
+      "img-src 'self' data: https:",
+      "font-src 'self'",
+      "connect-src 'self' ws: wss:",
+    ].join("; "),
+  );
   res.setHeader("X-Content-Type-Options", "nosniff");
+  res.setHeader("Referrer-Policy", "no-referrer");
 }
 
 function sendJson(res: ServerResponse, status: number, body: unknown) {
@@ -160,66 +177,10 @@ function serveFile(res: ServerResponse, filePath: string) {
   res.end(fs.readFileSync(filePath));
 }
 
-interface ControlUiInjectionOpts {
-  basePath: string;
-  assistantName?: string;
-  assistantAvatar?: string;
-}
-
-function injectControlUiConfig(html: string, opts: ControlUiInjectionOpts): string {
-  const { basePath, assistantName, assistantAvatar } = opts;
-  const script =
-    `<script>` +
-    `window.__OPENCLAW_CONTROL_UI_BASE_PATH__=${JSON.stringify(basePath)};` +
-    `window.__OPENCLAW_ASSISTANT_NAME__=${JSON.stringify(
-      assistantName ?? DEFAULT_ASSISTANT_IDENTITY.name,
-    )};` +
-    `window.__OPENCLAW_ASSISTANT_AVATAR__=${JSON.stringify(
-      assistantAvatar ?? DEFAULT_ASSISTANT_IDENTITY.avatar,
-    )};` +
-    `</script>`;
-  // Check if already injected
-  if (html.includes("__OPENCLAW_ASSISTANT_NAME__")) {
-    return html;
-  }
-  const headClose = html.indexOf("</head>");
-  if (headClose !== -1) {
-    return `${html.slice(0, headClose)}${script}${html.slice(headClose)}`;
-  }
-  return `${script}${html}`;
-}
-
-interface ServeIndexHtmlOpts {
-  basePath: string;
-  config?: OpenClawConfig;
-  agentId?: string;
-}
-
-function serveIndexHtml(res: ServerResponse, indexPath: string, opts: ServeIndexHtmlOpts) {
-  const { basePath, config, agentId } = opts;
-  const identity = config
-    ? resolveAssistantIdentity({ cfg: config, agentId })
-    : DEFAULT_ASSISTANT_IDENTITY;
-  const resolvedAgentId =
-    typeof (identity as { agentId?: string }).agentId === "string"
-      ? (identity as { agentId?: string }).agentId
-      : agentId;
-  const avatarValue =
-    resolveAssistantAvatarUrl({
-      avatar: identity.avatar,
-      agentId: resolvedAgentId,
-      basePath,
-    }) ?? identity.avatar;
+function serveIndexHtml(res: ServerResponse, indexPath: string) {
   res.setHeader("Content-Type", "text/html; charset=utf-8");
   res.setHeader("Cache-Control", "no-cache");
-  const raw = fs.readFileSync(indexPath, "utf8");
-  res.end(
-    injectControlUiConfig(raw, {
-      basePath,
-      assistantName: identity.name,
-      assistantAvatar: avatarValue,
-    }),
-  );
+  res.end(fs.readFileSync(indexPath, "utf8"));
 }
 
 function isSafeRelativePath(relPath: string) {
@@ -279,6 +240,35 @@ export function handleControlUiHttpRequest(
 
   applyControlUiSecurityHeaders(res);
 
+  const bootstrapConfigPath = basePath
+    ? `${basePath}${CONTROL_UI_BOOTSTRAP_CONFIG_PATH}`
+    : CONTROL_UI_BOOTSTRAP_CONFIG_PATH;
+  if (pathname === bootstrapConfigPath) {
+    const config = opts?.config;
+    const identity = config
+      ? resolveAssistantIdentity({ cfg: config, agentId: opts?.agentId })
+      : DEFAULT_ASSISTANT_IDENTITY;
+    const avatarValue = resolveAssistantAvatarUrl({
+      avatar: identity.avatar,
+      agentId: identity.agentId,
+      basePath,
+    });
+    if (req.method === "HEAD") {
+      res.statusCode = 200;
+      res.setHeader("Content-Type", "application/json; charset=utf-8");
+      res.setHeader("Cache-Control", "no-cache");
+      res.end();
+      return true;
+    }
+    sendJson(res, 200, {
+      basePath,
+      assistantName: identity.name,
+      assistantAvatar: avatarValue ?? identity.avatar,
+      assistantAgentId: identity.agentId,
+    });
+    return true;
+  }
+
   const rootState = opts?.root;
   if (rootState?.kind === "invalid") {
     res.statusCode = 503;
@@ -341,11 +331,7 @@ export function handleControlUiHttpRequest(
 
   if (fs.existsSync(filePath) && fs.statSync(filePath).isFile()) {
     if (path.basename(filePath) === "index.html") {
-      serveIndexHtml(res, filePath, {
-        basePath,
-        config: opts?.config,
-        agentId: opts?.agentId,
-      });
+      serveIndexHtml(res, filePath);
       return true;
     }
     serveFile(res, filePath);
@@ -355,11 +341,7 @@ export function handleControlUiHttpRequest(
   // SPA fallback (client-side router): serve index.html for unknown paths.
   const indexPath = path.join(root, "index.html");
   if (fs.existsSync(indexPath)) {
-    serveIndexHtml(res, indexPath, {
-      basePath,
-      config: opts?.config,
-      agentId: opts?.agentId,
-    });
+    serveIndexHtml(res, indexPath);
     return true;
   }
 
diff --git a/src/gateway/gateway-misc.test.ts b/src/gateway/gateway-misc.test.ts
index 033f4aa5352..a510f93550b 100644
--- a/src/gateway/gateway-misc.test.ts
+++ b/src/gateway/gateway-misc.test.ts
@@ -80,7 +80,68 @@ describe("handleControlUiHttpRequest", () => {
       );
       expect(handled).toBe(true);
       expect(setHeader).toHaveBeenCalledWith("X-Frame-Options", "DENY");
-      expect(setHeader).toHaveBeenCalledWith("Content-Security-Policy", "frame-ancestors 'none'");
+      const csp = setHeader.mock.calls.find((call) => call[0] === "Content-Security-Policy")?.[1];
+      expect(typeof csp).toBe("string");
+      expect(String(csp)).toContain("frame-ancestors 'none'");
+      expect(String(csp)).toContain("script-src 'self'");
+      expect(String(csp)).not.toContain("script-src 'self' 'unsafe-inline'");
+    } finally {
+      await fs.rm(tmp, { recursive: true, force: true });
+    }
+  });
+
+  it("does not inject inline scripts into index.html", async () => {
+    const tmp = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-ui-"));
+    try {
+      const html = "<html><head></head><body>Hello</body></html>\n";
+      await fs.writeFile(path.join(tmp, "index.html"), html);
+      const { res, end } = makeControlUiResponse();
+      const handled = handleControlUiHttpRequest(
+        { url: "/", method: "GET" } as IncomingMessage,
+        res,
+        {
+          root: { kind: "resolved", path: tmp },
+          config: {
+            agents: { defaults: { workspace: tmp } },
+            ui: { assistant: { name: "</script><script>alert(1)//", avatar: "evil.png" } },
+          },
+        },
+      );
+      expect(handled).toBe(true);
+      expect(end).toHaveBeenCalledWith(html);
+    } finally {
+      await fs.rm(tmp, { recursive: true, force: true });
+    }
+  });
+
+  it("serves bootstrap config JSON", async () => {
+    const tmp = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-ui-"));
+    try {
+      await fs.writeFile(path.join(tmp, "index.html"), "<html></html>\n");
+      const { res, end } = makeControlUiResponse();
+      const handled = handleControlUiHttpRequest(
+        { url: "/__openclaw/control-ui-config.json", method: "GET" } as IncomingMessage,
+        res,
+        {
+          root: { kind: "resolved", path: tmp },
+          config: {
+            agents: { defaults: { workspace: tmp } },
+            ui: { assistant: { name: "</script><script>alert(1)//", avatar: "</script>.png" } },
+          },
+        },
+      );
+      expect(handled).toBe(true);
+      const payload = String(end.mock.calls[0]?.[0] ?? "");
+      const parsed = JSON.parse(payload) as {
+        basePath: string;
+        assistantName: string;
+        assistantAvatar: string;
+        assistantAgentId: string;
+      };
+      expect(parsed.basePath).toBe("");
+      expect(parsed.assistantName).toBe("</script><script>alert(1)//");
+      expect(parsed.assistantAvatar).toBe("/avatar/main");
+      expect(parsed.assistantAgentId).toBe("main");
     } finally {
       await fs.rm(tmp, { recursive: true, force: true });
     }