B13658 permissions of the file qfq.json will be changed to rw-r----- after it is written.

extension/Classes/Core/Store/Config.php

@@ -166,6 +166,7 @@ class Config {
         $absoluteConf = Path::absoluteConf();
         HelperFile::createPathRecursive($absoluteConf);
         HelperFile::file_put_contents(Path::join($absoluteConf, CONFIG_QFQ_JSON), json_encode($config, JSON_PRETTY_PRINT));
+        chmod(Path::join($absoluteConf, CONFIG_QFQ_JSON), 0640);
     }
 
     /**