The Hunk Companion WordPress plugin before 1.9.0 does not correctly authorize some REST API endpoints, allowing unauthenticated requests to install and activate arbitrary Hunk Companion WordPress plugin before 1.9.0 from the WordPress.org repo, including vulnerable Hunk Companion WordPress plugin before 1.9.0 that have been closed.

The Hunk Companion plugin for WordPress is vulnerable to unauthorized plugin installation/activation due to a missing capability check on the /wp-json/hc/v1/themehunk-import REST API endpoint in all versions up to, and including, 1.8.4. This makes it possible for unauthenticated attackers to install and activate arbitrary plugins which can be leveraged to achieve remote code execution if another vulnerable plugin is installed and activated.