Academy LMS <= 4.0.1 - Authenticated (Contributor+) Arbitrary HTML File Read via 'id' Parameter in /wp/v2/templates REST Route

The Academy LMS – AI Course Builder, Quizzes, Certificates & eLearning plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 4.0.1 via the 'id' parameter. This makes it possible for authenticated attackers, with contributor-level access and above, to read the contents of arbitrary .html files on the server. The plugin appends a '.html' extension to the attacker-supplied path before reading it, so files with any other extension — including wp-config.php — are out of reach. The file's contents are returned in full in the REST JSON response's content field.