Multiple SQL injection vulnerabilities in admin/handlers.php in the GigPress plugin before 2.3.9 for WordPress allow remote authenticated users to execute arbitrary SQL commands via the (1) show_artist_id or (2) show_venue_id parameter in an add action in the gigpress.php page to wp-admin/admin.php.
Improper Neutralization of Special Elements used in an SQL Command The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.