diff --git a/src/web/api/bot.ts b/src/web/api/bot.ts
index a42376c..d6d8338 100755
--- a/src/web/api/bot.ts
+++ b/src/web/api/bot.ts
@@ -1,6 +1,6 @@
 import { Router } from "express";
 import type { BotManager } from "../../bot/manager.js";
-import type { BotConfig } from "../../data/config.js";
+import type { BotConfig, GuestModeConfig } from "../../data/config.js";
 import { saveConfig } from "../../data/config.js";
 import type { Logger } from "../../logger.js";
 import type { BotDatabase } from "../../data/database.js";
@@ -16,6 +16,7 @@ export function createBotRouter(
   logger: Logger,
   botDb: BotDatabase,
   avatarStore: AvatarStore,
+  onGuestPolicyChanged?: (cfg: GuestModeConfig) => void,
 ): Router {
   const router = Router();
 
@@ -55,7 +56,8 @@ export function createBotRouter(
     if (hasIdle) config.idleTimeoutMinutes = idleTimeoutMinutes;
     if (hasAutoPause) config.autoPauseOnEmpty = autoPauseOnEmpty;
 
-    if (guestMode !== undefined && guestMode !== null && typeof guestMode === "object") {
+    const hasGuestMode = guestMode !== undefined && guestMode !== null && typeof guestMode === "object";
+    if (hasGuestMode) {
       const gm = config.guestMode;
       if (typeof guestMode.enabled === "boolean") gm.enabled = guestMode.enabled;
       if (guestMode.bots === "all") {
@@ -74,6 +76,13 @@ export function createBotRouter(
 
     saveConfig(configPath, config);
 
+    // Guest-mode changed: tear down / re-scope in-flight guest WS sockets so a
+    // disabled or narrowed scope takes effect immediately (matches requireAuth's
+    // "disabling immediately invalidates in-flight guest sessions" invariant).
+    if (hasGuestMode) {
+      onGuestPolicyChanged?.(config.guestMode);
+    }
+
     // 通知所有 bot 实例更新
     for (const bot of botManager.getAllBots()) {
       if (hasIdle) bot.updateIdleTimeout(config.idleTimeoutMinutes);
diff --git a/src/web/server.ts b/src/web/server.ts
index da5258f..5b98d49 100755
--- a/src/web/server.ts
+++ b/src/web/server.ts
@@ -6,7 +6,7 @@ import { WebSocketServer } from "ws";
 import type { BotManager } from "../bot/manager.js";
 import type { MusicProvider } from "../music/provider.js";
 import type { BotDatabase } from "../data/database.js";
-import type { BotConfig } from "../data/config.js";
+import type { BotConfig, GuestModeConfig } from "../data/config.js";
 import type { Logger } from "../logger.js";
 import type { CookieStore } from "../music/auth.js";
 import type { AvatarStore } from "../data/avatars.js";
@@ -104,6 +104,11 @@ export function createWebServer(options: WebServerOptions): WebServer {
   app.use("/api", requireAuth);
 
   // ─── Protected routes ───────────────────────────────────────────────────
+  // The bot router is mounted BEFORE setupWebSocket runs, but its /settings
+  // handler needs to trigger a guest-policy refresh on the (later-created) WS
+  // controller. Bridge the two with a mutable indirection that starts as a
+  // no-op and is wired to the real refreshGuestPolicy once the WS is set up.
+  let onGuestPolicyChanged: (cfg: GuestModeConfig) => void = () => {};
   app.use(
     "/api/bot",
     createBotRouter(
@@ -113,6 +118,7 @@ export function createWebServer(options: WebServerOptions): WebServer {
       logger,
       options.database,
       options.avatarStore,
+      (cfg) => onGuestPolicyChanged(cfg),
     )
   );
   app.use(
@@ -195,7 +201,8 @@ export function createWebServer(options: WebServerOptions): WebServer {
       wss.emit("connection", ws, req);
     });
   });
-  const cleanupWs = setupWebSocket(wss, options.botManager, logger);
+  const controller = setupWebSocket(wss, options.botManager, logger);
+  onGuestPolicyChanged = controller.refreshGuestPolicy;
 
   // ─── Session cleanup interval ──────────────────────────────────────────
   let cleanupTimer: ReturnType<typeof setInterval> | null = null;
@@ -221,7 +228,7 @@ export function createWebServer(options: WebServerOptions): WebServer {
         clearInterval(cleanupTimer);
         cleanupTimer = null;
       }
-      cleanupWs();
+      controller.cleanup();
       wss.close();
       server.close();
     },
diff --git a/src/web/websocket-auth.test.ts b/src/web/websocket-auth.test.ts
index d49fbfd..c4ede10 100644
--- a/src/web/websocket-auth.test.ts
+++ b/src/web/websocket-auth.test.ts
@@ -102,7 +102,7 @@ describe("WebSocket guest bot scope", () => {
       off: () => {},
       removeListener: () => {},
     };
-    const cleanup = setupWebSocket(fakeWss, botManager, {
+    const { cleanup } = setupWebSocket(fakeWss, botManager, {
       debug() {},
       error() {},
       info() {},
@@ -114,3 +114,68 @@ describe("WebSocket guest bot scope", () => {
     cleanup();
   });
 });
+
+describe("WebSocket refreshGuestPolicy", () => {
+  function makeHarness() {
+    const clients: any[] = [];
+    const fakeWss: any = {
+      on: (ev: string, cb: any) => {
+        if (ev === "connection") fakeWss._conn = cb;
+      },
+    };
+    const botManager: any = {
+      getAllBots: () => [],
+      on: () => {},
+      off: () => {},
+      removeListener: () => {},
+    };
+    const logger = { debug() {}, error() {}, info() {}, warn() {} } as any;
+    const controller = setupWebSocket(fakeWss, botManager, logger);
+    // Connect fake sockets via the connection handler so they land in `clients`.
+    const connect = (ws: any) => {
+      clients.push(ws);
+      fakeWss._conn(ws);
+    };
+    return { controller, connect };
+  }
+
+  function makeFakeWs(opts: { isGuest: boolean; botScope?: "all" | Set<string> }) {
+    const closeCalls: Array<{ code?: number; reason?: string }> = [];
+    const ws: any = {
+      readyState: 1,
+      isGuest: opts.isGuest,
+      botScope: opts.botScope,
+      send: () => {},
+      on: () => {},
+      close: (code?: number, reason?: string) => closeCalls.push({ code, reason }),
+    };
+    return { ws, closeCalls };
+  }
+
+  it("disabling guest mode closes guest sockets but leaves non-guest sockets open", () => {
+    const { controller, connect } = makeHarness();
+    const guest = makeFakeWs({ isGuest: true, botScope: new Set(["bot1"]) });
+    const member = makeFakeWs({ isGuest: false, botScope: "all" });
+    connect(guest.ws);
+    connect(member.ws);
+
+    controller.refreshGuestPolicy({ enabled: false, bots: "all" });
+
+    expect(guest.closeCalls.length).toBe(1);
+    expect(guest.closeCalls[0].code).toBe(1008);
+    expect(member.closeCalls.length).toBe(0);
+  });
+
+  it("narrowing the guest scope live re-scopes open guest sockets", () => {
+    const { controller, connect } = makeHarness();
+    const guest = makeFakeWs({ isGuest: true, botScope: new Set(["bot1"]) });
+    connect(guest.ws);
+
+    controller.refreshGuestPolicy({ enabled: true, bots: ["bot2"] });
+
+    expect(guest.closeCalls.length).toBe(0);
+    expect(guest.ws.botScope instanceof Set).toBe(true);
+    expect(guest.ws.botScope.has("bot2")).toBe(true);
+    expect(guest.ws.botScope.has("bot1")).toBe(false);
+  });
+});
diff --git a/src/web/websocket.ts b/src/web/websocket.ts
index 8ca7f2a..ac36f74 100644
--- a/src/web/websocket.ts
+++ b/src/web/websocket.ts
@@ -3,11 +3,21 @@ import type { BotManager } from "../bot/manager.js";
 import type { BotInstance } from "../bot/instance.js";
 import type { Logger } from "../logger.js";
 
+export interface WebSocketController {
+  cleanup: () => void;
+  /**
+   * Re-apply the current guest-mode policy to every already-open guest socket.
+   * If guest mode is disabled, in-flight guest sockets are force-closed; otherwise
+   * each guest socket is live re-scoped so out-of-scope bots stop streaming.
+   */
+  refreshGuestPolicy: (cfg: { enabled: boolean; bots: "all" | string[] }) => void;
+}
+
 export function setupWebSocket(
   wss: WebSocketServer,
   botManager: BotManager,
   logger: Logger
-): () => void {
+): WebSocketController {
   const clients = new Set<WebSocket>();
 
   /**
@@ -150,7 +160,7 @@ export function setupWebSocket(
   }, 5000);
   ensureAllBotsAttached();
 
-  return () => {
+  const cleanup = () => {
     clearInterval(intervalId);
     botManager.removeListener("botInstance", onBotInstance);
     botManager.removeListener("botInstanceRemoved", onBotInstanceRemoved);
@@ -159,4 +169,25 @@ export function setupWebSocket(
       detachBotListener(id);
     }
   };
+
+  // When the admin changes guestMode (disable / narrow scope), already-open guest
+  // sockets must stop streaming immediately — their isGuest/botScope were stamped
+  // once at upgrade and would otherwise keep receiving bot state.
+  const refreshGuestPolicy = (cfg: { enabled: boolean; bots: "all" | string[] }) => {
+    for (const ws of clients) {
+      const w = ws as unknown as { isGuest?: boolean; botScope?: "all" | Set<string> };
+      if (!w.isGuest) continue;
+      if (!cfg.enabled) {
+        try {
+          ws.close(1008, "guest mode disabled");
+        } catch {
+          // socket may already be closing; ignore
+        }
+      } else {
+        w.botScope = cfg.bots === "all" ? "all" : new Set(cfg.bots);
+      }
+    }
+  };
+
+  return { cleanup, refreshGuestPolicy };
 }