diff --git a/surfsense_backend/tests/integration/test_connector_index_authz.py b/surfsense_backend/tests/integration/test_connector_index_authz.py
new file mode 100644
index 000000000..039a42760
--- /dev/null
+++ b/surfsense_backend/tests/integration/test_connector_index_authz.py
@@ -0,0 +1,142 @@
+"""Cross-search-space authorization on the connector index endpoint.
+
+``POST /search-source-connectors/{connector_id}/index?search_space_id=<X>`` must
+authorize against the **connector's own** ``search_space_id`` (matching the
+read/update/delete handlers), not the caller-supplied ``search_space_id`` query
+parameter, and must reject a connector that does not belong to the requested
+search space.
+
+Without this, a user who owns search space B could index another user's
+connector (which lives in space A) by passing ``search_space_id=B``: the
+background indexer would run with the **victim connector's stored credentials**
+and write the fetched content into the attacker's space. These tests pin that
+boundary.
+"""
+
+from __future__ import annotations
+
+import uuid
+from unittest.mock import AsyncMock, patch
+
+import pytest
+from fastapi import HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.db import (
+    SearchSourceConnector,
+    SearchSourceConnectorType,
+    SearchSpace,
+    User,
+)
+from app.routes.search_source_connectors_routes import index_connector_content
+from app.routes.search_spaces_routes import create_default_roles_and_membership
+
+pytestmark = pytest.mark.integration
+
+# The handler imports ``check_permission`` into its own module namespace.
+_CHECK_PERMISSION = "app.routes.search_source_connectors_routes.check_permission"
+
+
+async def _make_user_with_space(session: AsyncSession) -> tuple[User, SearchSpace]:
+    """A user plus a search space they own, with the default roles/membership
+    the ``POST /searchspaces`` route would create (so ``check_permission`` would
+    legitimately pass for this user on this space)."""
+    user = User(
+        id=uuid.uuid4(),
+        email=f"authz-{uuid.uuid4()}@surfsense.test",
+        hashed_password="x",
+        is_active=True,
+        is_superuser=False,
+        is_verified=True,
+    )
+    session.add(user)
+    await session.flush()
+    space = SearchSpace(name=f"Space {uuid.uuid4().hex[:8]}", user_id=user.id)
+    session.add(space)
+    await session.flush()
+    await create_default_roles_and_membership(session, space.id, user.id)
+    await session.flush()
+    return user, space
+
+
+async def _make_connector(
+    session: AsyncSession,
+    owner: User,
+    space: SearchSpace,
+    connector_type: SearchSourceConnectorType,
+) -> SearchSourceConnector:
+    connector = SearchSourceConnector(
+        name="Connector",
+        connector_type=connector_type,
+        # A stored credential the indexer would use — the thing a cross-tenant
+        # index must never be able to abuse.
+        config={"GITHUB_PAT": "victim-secret-pat", "repo_full_names": ["octocat/Hello-World"]},
+        is_indexable=True,
+        search_space_id=space.id,
+        user_id=owner.id,
+    )
+    session.add(connector)
+    await session.flush()
+    return connector
+
+
+class TestConnectorIndexCrossSpaceAuthz:
+    async def test_cross_space_index_is_rejected_before_permission_check(
+        self, db_session: AsyncSession
+    ):
+        """Attacker (owns space B) cannot index victim's connector (in space A)
+        by passing ``search_space_id=B``.
+
+        The mismatch is rejected with 404 **before** ``check_permission`` runs —
+        which is essential, because that permission check *would* pass: the
+        attacker legitimately holds ``CONNECTORS_UPDATE`` on their own space B.
+        """
+        victim, space_a = await _make_user_with_space(db_session)
+        attacker, space_b = await _make_user_with_space(db_session)
+        connector_a = await _make_connector(
+            db_session, victim, space_a, SearchSourceConnectorType.GITHUB_CONNECTOR
+        )
+
+        with patch(_CHECK_PERMISSION, new=AsyncMock()) as check_permission_mock:
+            with pytest.raises(HTTPException) as exc_info:
+                await index_connector_content(
+                    connector_id=connector_a.id,
+                    search_space_id=space_b.id,  # the attacker's own space
+                    session=db_session,
+                    user=attacker,
+                )
+
+        assert exc_info.value.status_code == 404
+        # Rejected at the search-space reconciliation, never reaching (or relying
+        # on) the permission check — which would have passed for space B.
+        check_permission_mock.assert_not_awaited()
+
+    async def test_same_space_index_authorizes_against_the_connectors_own_space(
+        self, db_session: AsyncSession
+    ):
+        """A legitimate same-space index passes the reconciliation and authorizes
+        ``check_permission`` against the connector's **own** search space (not the
+        client-supplied query param)."""
+        owner, space = await _make_user_with_space(db_session)
+        # A "live" connector type returns early (no Celery dispatch) right after
+        # the permission check, so the call exercises the authz path cleanly.
+        connector = await _make_connector(
+            db_session, owner, space, SearchSourceConnectorType.CLICKUP_CONNECTOR
+        )
+
+        with patch(_CHECK_PERMISSION, new=AsyncMock()) as check_permission_mock:
+            try:
+                await index_connector_content(
+                    connector_id=connector.id,
+                    search_space_id=space.id,  # the connector's own space
+                    session=db_session,
+                    user=owner,
+                )
+            except Exception:
+                # Any downstream indexing behaviour is irrelevant to the authz
+                # contract under test; we only assert what space was authorized.
+                pass
+
+        check_permission_mock.assert_awaited_once()
+        # The space passed to check_permission must be the connector's own space.
+        assert connector.search_space_id in check_permission_mock.await_args.args