diff --git a/sceptre/diffing/stack_differ.py b/sceptre/diffing/stack_differ.py
index a575c6afc..18577ef0b 100644
--- a/sceptre/diffing/stack_differ.py
+++ b/sceptre/diffing/stack_differ.py
@@ -201,6 +201,9 @@ def _create_deployed_stack_config(
             if err.response["Error"]["Message"].endswith("does not exist"):
                 return None
 
+            # Unknown error, raise it as-is
+            raise err
+
         stacks = description["Stacks"]
         for stack in stacks:
             if stack["StackStatus"] in self.STACK_STATUSES_INDICATING_NOT_DEPLOYED:
diff --git a/tests/test_diffing/test_stack_differ.py b/tests/test_diffing/test_stack_differ.py
index b05a2f045..234281cbe 100644
--- a/tests/test_diffing/test_stack_differ.py
+++ b/tests/test_diffing/test_stack_differ.py
@@ -234,6 +234,14 @@ def test_diff__deployed_stack_does_not_exist__returns_is_deployed_as_false(self)
         diff = self.differ.diff(self.actions)
         assert diff.is_deployed is False
 
+    def test_diff__raises_some_other_client_error(self):
+        self.actions.describe.side_effect = ClientError(
+            {"Error": {"Code": "ForbiddenException", "Message": "No access"}},
+            "DescribeStacks",
+        )
+        with pytest.raises(ClientError, match="No access"):
+            self.differ.diff(self.actions)
+
     def test_diff__deployed_stack_does_not_exist__compares_none_to_generated_config(
         self,
     ):