diff --git a/frontend-web/src/strategy-components/components/resource-management/llmwiki/WeKnoraKnowledgeDetailPage.tsx b/frontend-web/src/strategy-components/components/resource-management/llmwiki/WeKnoraKnowledgeDetailPage.tsx
index 2f4610e2..e733ae3a 100644
--- a/frontend-web/src/strategy-components/components/resource-management/llmwiki/WeKnoraKnowledgeDetailPage.tsx
+++ b/frontend-web/src/strategy-components/components/resource-management/llmwiki/WeKnoraKnowledgeDetailPage.tsx
@@ -51,7 +51,15 @@ function collectThemePayload(): DeerFlowThemePayload {
 function postThemeToFrame(frame: HTMLIFrameElement | null) {
   if (!frame?.contentWindow) return;
   const src = frame.getAttribute("src") || "";
+  if (!src) return;
   const targetOrigin = new URL(src, window.location.href).origin;
+  try {
+    const currentUrl = frame.contentWindow.location.href;
+    if (!currentUrl || currentUrl === "about:blank") return;
+    if (new URL(currentUrl, window.location.href).origin !== targetOrigin) return;
+  } catch {
+    // Reading location throws once the iframe has reached the cross-origin backend.
+  }
   frame.contentWindow.postMessage(collectThemePayload(), targetOrigin);
 }
 
diff --git a/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py b/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py
index 2b86e743..024328fe 100644
--- a/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py
+++ b/offline-backend-20260512/backend/app/gateway/routers/llmwiki.py
@@ -479,6 +479,9 @@ async def _authorize_weknora_api_proxy(
     if read_method and tail == ["me", "invitations", "pending-count"]:
         return
 
+    if read_method and tail == ["tenants", "kv", "retrieval-config"]:
+        return
+
     if tail[:1] == ["knowledge-bases"]:
         if len(tail) == 1:
             if method == "GET":
diff --git a/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py b/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py
index ff358381..313b36a4 100644
--- a/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py
+++ b/offline-backend-20260512/backend/tests/test_llmwiki_weknora.py
@@ -1425,3 +1425,49 @@ async def test_weknora_iframe_proxy_blocks_other_knowledge_bases() -> None:
         )
 
     assert exc_info.value.status_code == 403
+
+
+@pytest.mark.asyncio
+async def test_weknora_iframe_proxy_only_reads_tenant_retrieval_config() -> None:
+    from app.gateway.routers import llmwiki as llmwiki_router
+
+    class FakeRequest:
+        headers = Headers({})
+        query_params = QueryParams("")
+
+        def __init__(self, method: str) -> None:
+            self.method = method
+
+    ctx = llmwiki_router.WeKnoraEmbedContext(
+        mapping_id="local-kb",
+        weknora_id="remote-kb",
+        user_id="admin-a",
+        is_admin=True,
+        can_write=True,
+        exp=4_102_444_800,
+    )
+
+    await llmwiki_router._authorize_weknora_api_proxy(
+        FakeRequest("GET"),
+        ctx,
+        object(),
+        "/api/v1/tenants/kv/retrieval-config",
+        b"",
+        "token",
+    )
+
+    for method, path in (
+        ("GET", "/api/v1/tenants/kv/other-setting"),
+        ("PUT", "/api/v1/tenants/kv/retrieval-config"),
+    ):
+        with pytest.raises(HTTPException) as exc_info:
+            await llmwiki_router._authorize_weknora_api_proxy(
+                FakeRequest(method),
+                ctx,
+                object(),
+                path,
+                b"{}",
+                "token",
+            )
+
+        assert exc_info.value.status_code == 403