diff --git a/app/features/conditions/router.py b/app/features/conditions/router.py
index a4fcd049..d4e462fe 100644
--- a/app/features/conditions/router.py
+++ b/app/features/conditions/router.py
@@ -15,6 +15,7 @@ from app.library.config import Config
 from app.library.encoder import Encoder
 from app.library.Events import EventBus, Events
 from app.library.router import route
+from app.library.Utils import validate_url
 
 LOG: logging.Logger = logging.getLogger(__name__)
 
@@ -83,6 +84,11 @@ async def conditions_test(request: Request, encoder: Encoder, cache: Cache, conf
     if not (cond := params.get("condition")):
         return web.json_response({"error": "condition is required."}, status=web.HTTPBadRequest.status_code)
 
+    try:
+        validate_url(url, allow_internal=config.allow_internal_urls)
+    except ValueError as e:
+        return web.json_response({"error": str(e)}, status=web.HTTPBadRequest.status_code)
+
     try:
         preset: str = params.get("preset", config.default_preset)
         key: str = cache.hash(url + str(preset))
diff --git a/app/features/conditions/tests/test_conditions_repository.py b/app/features/conditions/tests/test_conditions.py
similarity index 85%
rename from app/features/conditions/tests/test_conditions_repository.py
rename to app/features/conditions/tests/test_conditions.py
index e5c69296..050f8aa6 100644
--- a/app/features/conditions/tests/test_conditions_repository.py
+++ b/app/features/conditions/tests/test_conditions.py
@@ -4,7 +4,14 @@ from __future__ import annotations
 
 import pytest
 import pytest_asyncio
+from types import SimpleNamespace
+import pytest
+from aiohttp import web
+from aiohttp.test_utils import make_mocked_request
 
+from app.features.conditions.router import conditions_test
+from app.library.config import Config
+from app.library.encoder import Encoder
 from app.features.conditions.repository import ConditionsRepository
 from app.library.sqlite_store import SqliteStore
 
@@ -33,6 +40,40 @@ async def repo():
     SqliteStore._reset_singleton()
 
 
+def _json_request(path: str, payload: object) -> web.Request:
+    request = make_mocked_request("POST", path)
+
+    async def _json() -> object:
+        return payload
+
+    request.json = _json  # type: ignore[attr-defined]
+    return request
+
+
+class TestAllowInternalUrlsScope:
+    def setup_method(self) -> None:
+        Config._reset_singleton()
+
+    @pytest.mark.asyncio
+    async def test_conditions_test_rejects_internal_url_when_disallowed(self) -> None:
+        config = Config.get_instance()
+        config.allow_internal_urls = False
+        encoder = Encoder()
+        cache = SimpleNamespace(hash=lambda value: value, has=lambda _key: False, set=lambda **_kwargs: None)
+
+        request = _json_request(
+            "/api/conditions/test/",
+            {"url": "http://127.0.0.1/test", "condition": "title", "preset": config.default_preset},
+        )
+
+        response = await conditions_test(request, encoder, cache, config)
+
+        assert response.status == web.HTTPBadRequest.status_code
+        body = response.body
+        assert isinstance(body, bytes)
+        assert b"internal urls" in body.lower()
+
+
 class TestConditionsRepository:
     """Test suite for ConditionsRepository database operations."""