We do have WP and Joomla sites continuously hacked. We would need a professional to examine the sites and tell us about their vulnerabilities. How injections are made, and how to prevent them.
21 freelancers are bidding on average $177 for this job
Are these sites hosted with one of these hosts? godaddy/bluehost/hostgator/justhost? I look forward to your response and will reply soon once I hear from you. Regards, Codinglogics