Modern Events Calendar (Lite & Pro) < 7.34.0 - Unauthenticated SQL Injection via mec_list_load_more

The Modern Event Calendar Pro WordPress plugin before 7.34.0, Modern Events Calendar Lite WordPress plugin before 7.34.0 do not sanitise and escape a request parameter before using it in a SQL statement, through an AJAX action available to unauthenticated users, leading to an unauthenticated SQL injection vulnerability that allows attackers to extract sensitive data from the database.