lib/pleroma/web/plugs/http_signature_plug.ex

@@ -64,7 +64,7 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
     if has_signature_header?(conn) do
       # set (request-target) header to the appropriate value
       # we also replace the digest header with the one we computed
-      possible_paths = route_aliases(conn) ++ [conn.request_path]
+      possible_paths = route_aliases(conn) ++ [conn.request_path, conn.request_path <> "?#{conn.query_string}"]
       assign_valid_signature_on_route_aliases(conn, possible_paths)
     else
       Logger.debug("No signature header!")