diff --git a/app/engine/routes/chat.py b/app/engine/routes/chat.py
index e49494f..bf3acb5 100644
--- a/app/engine/routes/chat.py
+++ b/app/engine/routes/chat.py
@@ -49,10 +49,9 @@ async def ws_chat(websocket: WebSocket):
             init_msg = json.loads(init_data)
 
             # Task 10: 客户端自报 site(空域名站点如 es 靠嵌入代码 data-site
-            # 接入)记入 client_info 作会话站点标——只加记录,不参与业务逻辑
+            # 接入)作会话站点标——只加记录,不参与业务逻辑;写入点在下方
+            # 新建会话处(优先级对齐 REST,见那里注释)
             site_slug = str(init_msg.get("site") or "").strip()
-            if site_slug:
-                client_info["site"] = site_slug
 
             if "session_id" in init_msg:
                 conv = await manager.get_by_session(init_msg["session_id"])
@@ -84,6 +83,11 @@ async def ws_chat(websocket: WebSocket):
                 # 无 XFF 时保留客户端自报，user_agent 等其他字段不受影响
                 if forwarded:
                     merged_info["ip"] = forwarded
+                # Task 10 复审: 专用 site 字段同样赢过 init_msg.client_info
+                # 自报的 site(与 REST ?site= 覆盖 req.client_info 的优先级
+                # 对齐——专用通道是嵌入代码显式声明,可信度高于任意自报 dict)
+                if site_slug:
+                    merged_info["site"] = site_slug
                 conv = await manager.create_conversation(
                     source=source,
                     client_info=merged_info,
diff --git a/app/engine/routes/public.py b/app/engine/routes/public.py
index 1f40b62..0f8d944 100644
--- a/app/engine/routes/public.py
+++ b/app/engine/routes/public.py
@@ -76,6 +76,11 @@ async def avatar(request: Request):
     # "/static/kefu-small.png" 这类路径,取基名后拼租户 assets 目录,无路径
     # 逃逸面(单成分文件名不可能越出 assets/)
     name = pathlib.PurePosixPath(str(site.brand.get("avatar") or "")).name
+    # 复审加固: PurePosixPath 不认反斜杠(整串留在 .name 里),Windows 文件
+    # 系统却把反斜杠当分隔符——seed_dir/assets/.. 会真穿出资产目录 serve
+    # 任意文件。显式拒绝分隔符与目录点,命中即回退静态兜底。
+    if name in {".", ".."} or "/" in name or "\\" in name:
+        name = ""
     candidate = runtime.seed_dir / "assets" / name if name else None
     if candidate is not None and candidate.is_file():
         return FileResponse(
diff --git a/static/chat.html b/static/chat.html
index afcb8d2..3a95cc6 100644
--- a/static/chat.html
+++ b/static/chat.html
@@ -30,7 +30,7 @@
             <div style="display:flex;align-items:center;gap:14px;">
               <div class="help-content">
                 <div class="help-title">How can we help?</div>
-                <div class="help-description">Ask about pipe specifications, quotations, MOQ, shipping and delivery.</div>
+                <div class="help-description">Ask about products, quotations, MOQ, shipping and delivery.</div>
               </div>
               <div class="help-actions">
                 <!-- Task 10: 联系按钮/标题/欢迎语/话题/隐私链接由 chat.js 从
diff --git a/static/js/chat.js b/static/js/chat.js
index 47180d8..49bf664 100644
--- a/static/js/chat.js
+++ b/static/js/chat.js
@@ -86,9 +86,12 @@ var chatBrandReady = (function () {
         var em = contactHref(emailAttr || b.email || "", "mail");
         if (emBtn) { if (em) emBtn.href = em; else emBtn.style.display = "none"; }
         if (b.placeholder) inputEl.placeholder = b.placeholder;
+        var firstMsg = document.querySelector("#messages .message");
+        var bubble = firstMsg && firstMsg.querySelector(".bubble");
         if (b.welcome) {
-            var bubble = document.querySelector("#messages .message .bubble");
             if (bubble) bubble.textContent = b.welcome;
+        } else if (firstMsg) {
+            firstMsg.style.display = "none"; // 空 welcome 不渲染空气泡(与挂件行为对齐)
         }
         if (Array.isArray(b.topics) && b.topics.length) {
             var grid = document.querySelector(".popular-topics-grid");
@@ -286,15 +289,8 @@ var chatBrandReady = (function () {
         }
     });
 
-    // Popular topics buttons(出厂模板的兜底话题;brand 下发后由 applyBrand
-    // 重建,这里的绑定覆盖"brand 失败"路径)
-    var topicBtns = document.querySelectorAll(".popular-topic-btn");
-    topicBtns.forEach(function (btn) {
-        btn.addEventListener("click", function () {
-            var topic = this.getAttribute("data-topic");
-            sendTopicMessage(topic);
-        });
-    });
+    // (出厂模板话题区为空——话题按钮只由 applyBrand 重建并自带绑定,
+    // 无静态兜底绑定段)
 
     // Task 10: 会话 key 租户化(cc_session_id_<slug>)——brand 落定(成功或
     // 失败,slug 回退 "default")后才读 key/连 WS,保证同浏览器多租户互不串
diff --git a/static/widget-test.html b/static/widget-test.html
index 89512ea..369c83d 100644
--- a/static/widget-test.html
+++ b/static/widget-test.html
@@ -39,11 +39,10 @@
     <p><strong>Expected behavior:</strong></p>
     <ul class="test-list">
       <li>Invite card appears after 5 seconds</li>
-      <li>Invite card has blue gradient header with robot emoji</li>
-      <li>Three topic buttons: "Get Quotation", "Pipe Specifications" and "Delivery &amp; Shipping"</li>
+      <li>Invite card has brand-color gradient header with robot emoji</li>
+      <li>Topic buttons come from the tenant brand config (<code>/api/public/brand</code> → topics)</li>
       <li>Action buttons: "Start Chat" and "No Thanks"</li>
-      <li>Click "Get Quotation" → invite closes → chat opens → message auto-sends</li>
-      <li>Click "Pipe Specifications" → invite closes → chat opens → message auto-sends</li>
+      <li>Click a topic button → invite closes → chat opens → message auto-sends</li>
       <li>Click "Start Chat" → invite closes → chat opens</li>
       <li>Click "No Thanks" → invite permanently closes</li>
       <li>Click "No Thanks" or X → refresh → invite stays hidden AND the old card area stays clickable (no invisible overlay; regression 2026-09-01)</li>
@@ -55,7 +54,7 @@
   <div class="info">
     <h2>Popular Topics in Chat Panel</h2>
     <ul class="test-list">
-      <li>Chat panel shows "POPULAR TOPICS" section with two buttons</li>
+      <li>Chat panel shows "POPULAR TOPICS" section with the tenant's topic buttons</li>
       <li>Click topic → message auto-sends → topics section hides</li>
     </ul>
   </div>
@@ -108,7 +107,7 @@
       "data-mobile": "true",
       "data-debug": "true",
       "data-whatsapp": "https://wa.me/8613800138000",
-      "data-email": "mailto:demo@hesupipe.com"
+      "data-email": "mailto:demo@example.com"
     };
 
     var rebuildLoading = false, rebuildPending = null;
@@ -116,6 +115,9 @@
       // Task 10: host id 已租户化(cc-widget-host-<slug>),按前缀清扫
       var hosts = document.querySelectorAll('[id^="cc-widget-host-"]');
       for (var i = 0; i < hosts.length; i++) hosts[i].remove();
+      // 复审: 清掉旧挂件的 debug 钩子——waitForWidget 轮询它,旧钩子残留
+      // 会让重建中的断言误读"新挂件已挂载"
+      try { delete window.__chatWidgetDebug; } catch (e) {}
     }
     function rebuildWidget(extra) {
       if (rebuildLoading) { rebuildPending = extra || {}; return; } // 快速连点:只记最新意图,当前加载完接力重建
diff --git a/static/widget.js b/static/widget.js
index d95df6e..61657fb 100644
--- a/static/widget.js
+++ b/static/widget.js
@@ -388,7 +388,7 @@
     panel.className = "chat-panel";
     panel.innerHTML = [
         '<div class="panel-header">',
-        '<div class="avatar"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="'+avatarUrl+'"></div>',
+        '<div class="avatar"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="'+esc(avatarUrl)+'"></div>',
         '<div class="info"><h3>' + esc(title) + '</h3><div class="status">Online now · Usually replies in minutes</div></div>',
         '<div class="actions">',
         '<button class="action-btn" aria-label="Minimize">−</button>',
@@ -396,7 +396,7 @@
         '</div></div>',
         '<div class="ended" id="w-ended">Chat ended. We\'ll be in touch!</div>',
         '<div class="panel-top">',
-        '<div class="help-block"><div style="display:flex;align-items:center;gap:14px;"><div class="help-content"><div class="help-title">How can we help?</div><div class="help-description">Ask about pipe specifications, quotations, MOQ, shipping and delivery.</div></div><div class="help-actions">' + waBtnHtml + emBtnHtml + '</div></div></div>',
+        '<div class="help-block"><div style="display:flex;align-items:center;gap:14px;"><div class="help-content"><div class="help-title">How can we help?</div><div class="help-description">Ask about products, quotations, MOQ, shipping and delivery.</div></div><div class="help-actions">' + waBtnHtml + emBtnHtml + '</div></div></div>',
         '</div>',
         '<div class="chat-separator"></div>',
         '<div class="panel-messages" id="w-msgs">',
@@ -416,10 +416,10 @@
         '<div class="invite-panel hide">',
         '<div class="invite-header">',
         '<div class="invite-icon-wrapper">',
-        '<div class="invite-icon"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="'+avatarUrl+'"><span class="invite-status-dot"></span></div>',
+        '<div class="invite-icon"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="'+esc(avatarUrl)+'"><span class="invite-status-dot"></span></div>',
         '</div>',
         '<div class="invite-header-content">',
-        '<div class="invite-title">Chat with us for pipe specs, MOQ, delivery timing and quotations.</div>',
+        '<div class="invite-title">Chat with us for products, quotations and delivery.</div>',
         '</div>',
         '<div class="invite-header-actions">',
         '<button class="invite-close-btn" aria-label="Close">',
@@ -467,13 +467,13 @@
     toggleBtn.className = "toggle-btn" + (isMobile ? " mobile" : "");
     if (isMobile) {
         toggleBtn.innerHTML = `
-  <div class="mobile-circle"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="${avatarUrl}"><span class="mobile-dot"></span></div>
+  <div class="mobile-circle"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="${esc(avatarUrl)}"><span class="mobile-dot"></span></div>
   <span class="mobile-label">Chat with us</span>
 `;
     } else {
         toggleBtn.innerHTML = `
   <div class="toggle-avatar-wrap">
-    <div class="toggle-avatar-circle"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="${avatarUrl}"></div>
+    <div class="toggle-avatar-circle"><span class="avatar-emoji">🤖</span><img class="avatar-img" alt="" src="${esc(avatarUrl)}"></div>
     <div class="toggle-avatar-dot"></div>
   </div>
   <div style="color:white;">
diff --git a/tests/test_brand_endpoint.py b/tests/test_brand_endpoint.py
index 2b9173d..98f26c2 100644
--- a/tests/test_brand_endpoint.py
+++ b/tests/test_brand_endpoint.py
@@ -6,8 +6,22 @@
 - 响应头 Access-Control-Allow-Origin: *(挂件嵌在客户站,跨源加载);
 - ?site=<slug> 站点覆盖(空域名站点如 es 靠嵌入代码 data-site 接入),
   未知 site 回退租户默认门面;
-- 头像按租户解析 seed_profiles/<slug>/assets/,两租户各归各。
+- 头像按租户解析 seed_profiles/<slug>/assets/,两租户各归各;
+- avatar 文件名解析拒绝路径穿越(PurePosixPath 不认反斜杠,Windows 下
+  反斜杠相对路径会真穿出资产目录 serve 任意文件)。
 """
+import json
+import shutil
+from pathlib import Path
+
+from tests.conftest import (
+    JIANCAI_HOST,
+    SEED_DIR,
+    app_test_client,
+    build_app,
+)
+
+REPO = Path(__file__).resolve().parents[1]
 
 BRAND_EXPECTED = {"slug", "title", "color", "avatar", "welcome", "topics",
                   "placeholder", "whatsapp", "email", "privacy_url"}
@@ -44,3 +58,30 @@ def test_avatar_served_per_tenant(app_client):
     r_jc = app_client.get("/api/public/avatar")   # base_url = jiancai 域
     assert r_jc.status_code == 200
     assert r.content != r_jc.content
+
+
+def test_avatar_rejects_windows_backslash_traversal(tmp_path):
+    """复审加固: brand.avatar 含反斜杠/斜杠/. 或 .. 时必须回退静态兜底。
+
+    PurePosixPath 把 "..\\..\\..\\secret.txt" 当单个组件留在 .name 里,
+    Windows 文件系统却会把反斜杠当分隔符——不加守卫时
+    seed_dir/assets/../../..\\secret.txt 真解析到资产目录外(serve 任意
+    文件)。目标文件真实存在于穿越终点,守卫失效即红。"""
+    seed = tmp_path / "seed"
+    shutil.copytree(SEED_DIR, seed)
+    tenant_json = seed / "jiancai" / "tenant.json"
+    data = json.loads(tenant_json.read_text(encoding="utf-8"))
+    data["config"]["brand"]["avatar"] = "..\\..\\..\\secret.txt"
+    tenant_json.write_text(json.dumps(data, ensure_ascii=False), encoding="utf-8")
+    # 穿越终点: <tmp>/seed/jiancai/assets 起三个 ".." → <tmp>/secret.txt
+    secret = tmp_path / "secret.txt"
+    secret.write_bytes(b"TOPSECRET-should-never-be-served")
+
+    a = build_app(seed, tmp_path / "data")
+    with app_test_client(a, f"http://{JIANCAI_HOST}", tmp_path) as c:
+        r = c.get("/api/public/avatar")
+        assert r.status_code == 200
+        assert r.headers["content-type"].startswith("image/")
+        assert b"TOPSECRET" not in r.content            # 穿越目标不被 serve
+        fallback = (REPO / "static" / "kefu-small.png").read_bytes()
+        assert r.content == fallback                    # 落静态兜底头像
diff --git a/tests/test_widget_namespacing.py b/tests/test_widget_namespacing.py
index a70e0d1..d59ccd0 100644
--- a/tests/test_widget_namespacing.py
+++ b/tests/test_widget_namespacing.py
@@ -8,6 +8,7 @@
 import asyncio
 import json
 from pathlib import Path
+from urllib.parse import urlparse
 
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
@@ -72,15 +73,47 @@ def test_brand_values_live_in_seed_profiles():
     assert ab["topics"] == ["Get Quotation", "Distributor Cooperation"]
 
 
+def _brand_identity_values():
+    """复审动态化: 从全部 seed_profiles/*/tenant.json(租户默认门面 + 各站点
+    覆盖)收集品牌身份值作禁词表——第三租户落地即自动纳管,无需改本测试。
+
+    只收身份字段(title/whatsapp/email/privacy_url/welcome/topics);
+    color 与 avatar 文件名是中性 UI 默认(widget.js 的 DEFAULT_COLOR=
+    #066fc0 恰等于 jiancai 品牌色、DEFAULT_AVATAR_PATH 兜底文件同名),
+    收进来会误伤合法兜底。privacy_url 额外拆主机名(含去 www. 裸域名),
+    whatsapp 额外收去 + 变体(客户端硬编码裸号也算残留)。"""
+    values = set()
+    for tenant_file in sorted(SEED.glob("*/tenant.json")):
+        cfg = json.loads(tenant_file.read_text(encoding="utf-8"))
+        brands = [cfg.get("config", {}).get("brand") or {}]
+        brands += [s.get("brand") or {} for s in cfg.get("sites", [])]
+        for b in brands:
+            for key in ("title", "whatsapp", "email", "privacy_url", "welcome"):
+                v = str(b.get(key) or "").strip()
+                if v:
+                    values.add(v)
+                    values.add(v.lstrip("+"))
+            for t in b.get("topics") or []:
+                if str(t).strip():
+                    values.add(str(t).strip())
+            host = urlparse(str(b.get("privacy_url") or "")).hostname or ""
+            if host:
+                values.add(host)
+                if host.startswith("www."):
+                    values.add(host[4:])
+    assert values, "禁词表收集为空——seed_profiles 结构变了?"
+    return values
+
+
 def test_no_brand_copy_left_in_client_files():
-    """等价迁移锚:三份客户端文件不再内嵌任何租户品牌值(联系号/邮箱/品牌名/
-    隐私 URL),品牌只经 /api/public/brand 下发。"""
-    for rel in ("widget.js", "js/chat.js", "chat.html"):
+    """等价迁移锚:四份客户端文件不再内嵌任何租户品牌值(联系号/邮箱/品牌名/
+    隐私 URL/welcome/topics),品牌只经 /api/public/brand 下发。禁词表动态
+    收集自 seed_profiles(见 _brand_identity_values)。"""
+    forbidden = _brand_identity_values()
+    for rel in ("widget.js", "js/chat.js", "chat.html", "widget-test.html"):
         src = _read(rel)
-        assert "HESUPIPE" not in src, f"{rel} 残留品牌名"
-        assert "8615937108317" not in src and "8619037179250" not in src, f"{rel} 残留联系号"
-        assert "hesuu.com" not in src and "borderlesscar.com" not in src, f"{rel} 残留邮箱域名"
-        assert "hesupipe.com" not in src, f"{rel} 残留隐私 URL 域名"
+        for v in forbidden:
+            assert v not in src, f"{rel} 残留品牌值: {v!r}"
 
 
 # ---- 服务端配套:会话打站点标 ---------------------------------------------------
@@ -125,3 +158,25 @@ def test_rest_session_site_query_recorded(app_client, tmp_path):
 def test_rest_session_without_site_no_tag(app_client, tmp_path):
     sid = app_client.post("/api/chat/session", json={}).json()["session_id"]
     assert "site" not in _read_client_info(tmp_path / "jiancai.db", sid)
+
+
+# ---- 复审: 专用 site 通道优先级(WS 与 REST 对齐) -------------------------------
+
+
+def test_ws_dedicated_site_wins_over_self_reported(app_client, tmp_path):
+    """WS init 同时带专用 site 字段与 client_info 自报 site 时,专用字段赢
+    (与 REST ?site= 覆盖 req.client_info 的优先级对齐——专用通道是嵌入
+    代码显式声明,可信度高于任意自报 dict)。"""
+    with app_client.websocket_connect("/ws/chat") as ws:
+        ws.send_text(json.dumps({"source": "widget", "site": "es",
+                                 "client_info": {"site": "main"}}))
+        sid = ws.receive_json()["session_id"]
+    assert _read_client_info(tmp_path / "jiancai.db", sid).get("site") == "es"
+
+
+def test_rest_site_query_wins_over_body_client_info(app_client, tmp_path):
+    # 同上语义的 REST 钉子: ?site= 覆盖请求体 client_info 自报的 site
+    sid = app_client.post(
+        "/api/chat/session?site=es", json={"client_info": {"site": "main"}}
+    ).json()["session_id"]
+    assert _read_client_info(tmp_path / "jiancai.db", sid).get("site") == "es"