The LearnPress plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.4.10 via deserialization of untrusted input from the 'checkout-email' request parameter during the checkout AJAX action. The value is passed through sanitizetextfield(), which does not strip serialized object syntax, then stored in the LearnPress session table and later fed to LPHelper::maybeunserialize() → unserialize() (without an allowedclasses restriction) by LPSessionHandler::get() on subsequent requests. This makes it possible for unauthenticated attackers to inject a PHP Object.

The LearnPress plugin for WordPress is vulnerable to unauthorized modification of arbitrary WordPress options in versions up to, and including, 4.4.4 via the learnpresscreatepage AJAX action. The LPAdminAjax::createpage() handler only checks the editpages capability and a wprest nonce (both available to Editors), then reads the fieldname parameter from the request without restricting it to a learnpress allow-list before passing it as the option key to LPHelper::createpage(), which calls updateoption($keyoption, $pageid). This makes it possible for authenticated attackers, with Editor-level access and above, to update arbitrary WordPress options to a positive integer (a newly created page ID), enabling actions such as flipping userscanregister to a truthy value to open public registration, corrupting activeplugins to break the site, or otherwise tampering with site-wide settings normally reserved for administrators.

The LearnPress WordPress plugin before 4.4.1 does not escape a search parameter before reflecting it into an HTML attribute, leading to Reflected Cross-Site Scripting that executes in the browser of a logged-in instructor or administrator who is tricked into opening a crafted link.