dataForDepandantField in models/custormfields.php in the JS JOBS FREE extension before 1.2.7 for Joomla! allows SQL Injection via the index.php?option=com_jsjobs&task=customfields.getfieldtitlebyfieldandfieldfo child parameter.
https://gist.github.com/blackcon/c61771eb8c9f0aeef6f6797f945efa13