diff --git a/src/components/iframe-bridge.tsx b/src/components/iframe-bridge.tsx
index 247ef64..a0fc1bb 100644
--- a/src/components/iframe-bridge.tsx
+++ b/src/components/iframe-bridge.tsx
@@ -5,9 +5,10 @@ import { useEffect, useCallback, type ReactNode } from "react";
 import { usePlayerSessionStore } from "@/stores/player-session-store";
 import { setPlayerBearerToken } from "@/lib/lottery-auth";
 import {
-  isIframeOriginAllowed,
   loadIframeAllowedOrigins,
+  messageToken,
   resolvePostMessageTargetOrigin,
+  resolveTrustedParentMessage,
 } from "@/lib/iframe-origins";
 
 function sanitizeUrlForParent(href: string): string {
@@ -123,39 +124,38 @@ export function IframeBridge({ children }: { children: ReactNode }): ReactNode {
     console.log("[IframeBridge] Setting up iframe communication");
 
     const handleMessage = async (event: MessageEvent): Promise<void> => {
-      if (!isIframeOriginAllowed(event.origin)) {
-        await loadIframeAllowedOrigins(true);
-        if (!isIframeOriginAllowed(event.origin)) {
-          console.warn("[IframeBridge] Rejected message from:", event.origin);
-          return;
-        }
+      const data = await resolveTrustedParentMessage(event);
+      if (data === null) {
+        console.warn("[IframeBridge] Rejected untrusted parent message from:", event.origin);
+        return;
       }
 
-      const { data } = event;
-      if (!data || typeof data !== "object") return;
-
       console.log("[IframeBridge] Received message:", data.type);
 
       switch (data.type) {
         // 主站发送初始化 Token
-        case "MAIN_INIT_TOKEN":
-          if (data.token) {
+        case "MAIN_INIT_TOKEN": {
+          const token = messageToken(data);
+          if (token !== null) {
             console.log("[IframeBridge] Received initial token");
-            setBearerToken(data.token);
-            setPlayerBearerToken(data.token);
+            setBearerToken(token);
+            setPlayerBearerToken(token);
             // 勿再 notifyReady()，否则主站会重复 MAIN_INIT_TOKEN 导致消息刷屏
           }
           break;
+        }
 
         // 主站刷新 Token
-        case "MAIN_REFRESH_TOKEN":
-          if (data.token) {
+        case "MAIN_REFRESH_TOKEN": {
+          const token = messageToken(data);
+          if (token !== null) {
             console.log("[IframeBridge] Received refreshed token");
-            setBearerToken(data.token);
-            setPlayerBearerToken(data.token);
+            setBearerToken(token);
+            setPlayerBearerToken(token);
             notifyTokenRefreshed();
           }
           break;
+        }
 
         // 主站通知 Token 即将过期
         case "MAIN_TOKEN_EXPIRING":
@@ -173,7 +173,7 @@ export function IframeBridge({ children }: { children: ReactNode }): ReactNode {
 
         // 主站导航请求
         case "MAIN_NAVIGATE":
-          if (data.path && typeof data.path === "string") {
+          if (typeof data.path === "string") {
             const nextPath = resolveSafeInAppPath(data.path);
             if (nextPath) {
               window.history.pushState({}, "", nextPath);
diff --git a/src/hooks/use-token-refresh.ts b/src/hooks/use-token-refresh.ts
index 81c779a..0b1ee54 100644
--- a/src/hooks/use-token-refresh.ts
+++ b/src/hooks/use-token-refresh.ts
@@ -5,9 +5,10 @@ import { parseJwtExp } from "@/lib/jwt-payload";
 import { usePlayerSessionStore } from "@/stores/player-session-store";
 import { useErrorStore } from "@/stores/error-store";
 import {
-  isIframeOriginAllowed,
   loadIframeAllowedOrigins,
+  messageToken,
   resolvePostMessageTargetOrigin,
+  resolveTrustedParentMessage,
 } from "@/lib/iframe-origins";
 
 /** Token 过期前警告阈值（毫秒） */
@@ -118,25 +119,21 @@ export function useTokenRefresh(): {
     void loadIframeAllowedOrigins();
 
     const handleMessage = async (event: MessageEvent): Promise<void> => {
-      if (!isIframeOriginAllowed(event.origin)) {
-        await loadIframeAllowedOrigins(true);
-        if (!isIframeOriginAllowed(event.origin)) {
-          console.warn("[TokenRefresh] Ignored message from unknown origin:", event.origin);
-          return;
-        }
+      const data = await resolveTrustedParentMessage(event);
+      if (data === null) {
+        console.warn("[TokenRefresh] Ignored untrusted parent message from:", event.origin);
+        return;
       }
 
-      const { data } = event;
-      if (!data || typeof data !== "object") return;
-
       // 处理主站发送的新 Token（兼容 MAIN_REFRESH_TOKEN 与 LOTTERY_TOKEN_REFRESH_RESPONSE）
+      const token = messageToken(data);
       if (
         (data.type === "LOTTERY_TOKEN_REFRESH_RESPONSE" || data.type === "MAIN_REFRESH_TOKEN") &&
-        data.token
+        token !== null
       ) {
         console.log("[TokenRefresh] Received new token from parent");
         pendingRefreshRef.current = 0;
-        setBearerToken(data.token);
+        setBearerToken(token);
         retryCountRef.current = 0;
       }
 
diff --git a/src/lib/iframe-origins.ts b/src/lib/iframe-origins.ts
index 2dac69a..472adf7 100644
--- a/src/lib/iframe-origins.ts
+++ b/src/lib/iframe-origins.ts
@@ -111,6 +111,42 @@ export function isIframeOriginAllowed(origin: string): boolean {
   return allowedOrigins.includes(normalized);
 }
 
+function isPlainMessageObject(value: unknown): value is Record<string, unknown> {
+  if (Object.prototype.toString.call(value) !== "[object Object]") return false;
+
+  const prototype = Object.getPrototypeOf(value);
+  return prototype === Object.prototype || prototype === null;
+}
+
+/** 仅接收当前 iframe 的真实父窗口发来的白名单消息。 */
+export async function resolveTrustedParentMessage(
+  event: MessageEvent,
+): Promise<Record<string, unknown> | null> {
+  if (typeof window === "undefined" || window.parent === window) {
+    return null;
+  }
+  if (event.source !== window.parent) {
+    return null;
+  }
+
+  if (!isIframeOriginAllowed(event.origin)) {
+    await loadIframeAllowedOrigins(true);
+    if (!isIframeOriginAllowed(event.origin)) {
+      return null;
+    }
+  }
+
+  return isPlainMessageObject(event.data) ? event.data : null;
+}
+
+export function messageToken(data: Record<string, unknown>): string | null {
+  const token = data.token;
+  if (typeof token !== "string") return null;
+
+  const trimmed = token.trim();
+  return trimmed === "" ? null : trimmed;
+}
+
 /** postMessage 目标：优先 referrer 对应白名单，否则取首个白名单 origin；无白名单时拒绝发送 */
 export function resolvePostMessageTargetOrigin(): string | null {
   const allowedOrigins = getKnownIframeAllowedOrigins();