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The Assistant for NextGEN Gallery plugin for WordPress is vulnerable to arbitrary directory deletion due to insufficient file path validation in the /wp-json/nextgenassistant/v1.0.0/control REST endpoint in all versions up to, and including, 1.0.9. This makes it possible for unauthenticated attackers to delete arbitrary directories on the server, which can cause a complete loss of availability.
The NextGEN Gallery WordPress plugin before 3.59.1 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when unfilteredhtml is disallowed