diff --git a/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py b/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py
index 31703a11..552dbcb5 100644
--- a/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py
+++ b/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py
@@ -1360,15 +1360,17 @@ def _weknora_embed_target_path(weknora_id: str, tab: str) -> str:
 
 def _set_weknora_embed_cookie(request: Request, response: Response, payload: dict[str, Any]) -> None:
     secure = is_secure_request(request)
-    response.set_cookie(
-        _WEKNORA_EMBED_COOKIE,
-        _sign_embed_payload(payload),
-        max_age=_WEKNORA_EMBED_TTL_SECONDS,
-        httponly=True,
-        secure=secure,
-        samesite="none" if secure else "lax",
-        path="/",
-    )
+    signed = _sign_embed_payload(payload)
+    for path in ("/", _WEKNORA_PUBLIC_PREFIX):
+        response.set_cookie(
+            _WEKNORA_EMBED_COOKIE,
+            signed,
+            max_age=_WEKNORA_EMBED_TTL_SECONDS,
+            httponly=True,
+            secure=secure,
+            samesite="none" if secure else "lax",
+            path=path,
+        )
     response.headers["Cache-Control"] = "no-store"
 
 
diff --git a/offline-backend-20260512/backend/app/gateway/weknora_embed.py b/offline-backend-20260512/backend/app/gateway/weknora_embed.py
index 6de5e448..9fc26c8e 100644
--- a/offline-backend-20260512/backend/app/gateway/weknora_embed.py
+++ b/offline-backend-20260512/backend/app/gateway/weknora_embed.py
@@ -14,10 +14,11 @@ from typing import Any
 
 from fastapi import HTTPException
 
+from deerflow.config.runtime_paths import runtime_home
+
 WEKNORA_EMBED_COOKIE = "deerflow_weknora_embed"
 WEKNORA_EMBED_TTL_SECONDS = 15 * 60
 WEKNORA_EMBED_API_PREFIX = "/api/llmwiki/weknora-embed"
-WEKNORA_PROXY_SECRET = os.getenv("DEERFLOW_LLMWIKI_PROXY_SECRET") or secrets.token_urlsafe(48)
 WEKNORA_ROOT_ASSET_PATHS: frozenset[str] = frozenset(
     {
         "/favicon.ico",
@@ -29,6 +30,31 @@ WEKNORA_ROOT_ASSET_PATHS: frozenset[str] = frozenset(
 )
 
 
+def _load_weknora_proxy_secret() -> str:
+    if secret := os.getenv("DEERFLOW_LLMWIKI_PROXY_SECRET"):
+        return secret
+    secret_path = runtime_home() / "weknora_embed_secret"
+    try:
+        if secret_path.is_file():
+            secret = secret_path.read_text(encoding="utf-8").strip()
+            if secret:
+                return secret
+        secret_path.parent.mkdir(parents=True, exist_ok=True)
+        secret = secrets.token_urlsafe(48)
+        try:
+            fd = os.open(str(secret_path), os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o600)
+        except FileExistsError:
+            return secret_path.read_text(encoding="utf-8").strip()
+        with os.fdopen(fd, "w", encoding="utf-8") as handle:
+            handle.write(secret)
+        return secret
+    except OSError:
+        return secrets.token_urlsafe(48)
+
+
+WEKNORA_PROXY_SECRET = _load_weknora_proxy_secret()
+
+
 @dataclass(frozen=True)
 class WeKnoraEmbedContext:
     mapping_id: str
diff --git a/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py b/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py
index a0e3480e..c670605e 100644
--- a/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py
+++ b/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py
@@ -234,6 +234,13 @@ async def test_weknora_session_endpoint_sets_cookie_and_returns_platform_path(mo
     assert "deerflow_weknora_embed=" in cookie
     assert "Secure" in cookie
     assert "SameSite=none" in cookie
+    set_cookie_headers = [
+        value.decode("latin-1")
+        for key, value in response.raw_headers
+        if key.lower() == b"set-cookie"
+    ]
+    assert any("Path=/" in value for value in set_cookie_headers)
+    assert any("Path=/deerflow" in value for value in set_cookie_headers)
     raw = cookie.split("deerflow_weknora_embed=", 1)[1].split(";", 1)[0]
     ctx = llmwiki_router._verify_embed_cookie(raw)
     assert ctx.mapping_id == "local-kb"