The gigpress plugin before 2.3.11 for WordPress has XSS.

GigPress < 2.3.28 - Contributor+ Stored XSS via Shortcode

The GigPress WordPress plugin before 2.3.28 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks

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.

GigPress <= 2.3.28 - Subscriber+ SQLi

The GigPress WordPress plugin through 2.3.28 does not validate and escape some of its shortcode attributes before using them in SQL statement/s, which could allow any authenticated users, such as subscriber to perform SQL Injection attacks

GigPress <= 2.3.29 - Admin+ Stored Cross Site Scripting

The GigPress WordPress plugin through 2.3.29 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)

The gigpress plugin before 2.3.11 for WordPress has SQL injection in the admin area, a different vulnerability than CVE-2015-4066.