Input validation vulnerability in RJ Quickcharts 0.6.1

The RJ Quickcharts plugin for WordPress can be hacked through a technique called SQL Injection. This vulnerability exists in versions up to and including 0.6.1 because the plugin does not properly secure user input and the SQL query is not prepared well enough. This means that attackers who have at least subscriber-level access can add their own SQL queries to the existing ones and potentially access private information from the database.