Spacious <= 1.9.11 - Missing Authorization to Autheticated (Subscriber+) Demo Data Import

The Spacious theme for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'welcome_notice_import_handler' function in all versions up to, and including, 1.9.11. This makes it possible for authenticated attackers, with Subscriber-level access and above, to import demo data into the site.