The Easy Digital Downloads (EDD) Recount Earnings extension for WordPress as used with EDD 1.8.x before 1.8.7 1.9.x before 1.9.10 2.0.x before 2.0.5 2.1.x before 2.1.11 2.2.x before 2.2.9 and 2.3.x before 2.3.7 has XSS because add_query_arg is misused.