RSVPMarker <= 9.9.3 is vulnerable to SQL Injection vulnerability

The RSVPMaker plugin for WordPress is vulnerable to SQL Injection via the ‘$email’ variable in versions up to, and including, 9.9.3 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for Admin level attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.