WP Project Manager <= 2.6.15 - Authenticated (Subscriber+) Sensitive Information Exposure via Project Task List REST API

The WP Project Manager plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.6.15 via the Project Task List ('/wp-json/pm/v2/projects/1/task-lists') REST API endpoint. This makes it possible for authenticated attackers, with Subscriber-level access and above, to extract sensitive data including the hashed passwords of project owners (e.g. adminstrators).