CVE-2026-16759

A race condition vulnerability in Tutor LMS by Themeum allows leveraging race conditions. Affects versions from n/a through 4.1.1.

The Tutor LMS plugin for WordPress up to version 4.0.1 is vulnerable to generic SQL Injection via the 'coupon_code' parameter due to insufficient escaping and lack of proper query preparation. Authenticated attackers with administrator-level access or higher can append additional SQL queries to existing ones, potentially extracting sensitive information from the database.

The Tutor LMS WordPress plugin before version 4.0.6 does not prevent request data from overwriting internal variables while rendering templates, allowing unauthenticated users to invoke arbitrary zero-argument PHP functions and receive their output.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Themeum Tutor LMS tutor allows Reflected XSS.This issue affects Tutor LMS: from n/a through 4.1.0.

The Tutor LMS plugin for WordPress in versions up to and including 4.0.7 is vulnerable to Insecure Direct Object Reference via the tutor_quiz_builder_save AJAX action due to missing validation that nested question_id, answer_id, deleted_question_ids[], and deleted_answer_ids[] values belong to a quiz/topic/course the requester is authorized to manage. An authenticated attacker with Instructor-level access or higher can overwrite content and re-parent arbitrary quiz questions/answers belonging to other instructors or administrators, and delete arbitrary quiz question and answer rows.

The Tutor LMS plugin for WordPress (versions up to and including 4.0.8) is vulnerable to Insecure Direct Object Reference (IDOR) via the 'student_id' parameter. Missing validation on a user-controlled key allows authenticated attackers with subscriber-level access and above to disclose the email address and Tutor profile phone number of arbitrary WordPress users, including Administrators, by iterating over user IDs.

The Tutor LMS plugin for WordPress (versions up to and including 4.0.8) is vulnerable to Reflected Cross-Site Scripting via the 'search' parameter due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts into pages that execute if they can trick a user into clicking a link.

The Tutor LMS plugin for WordPress (versions up to and including 4.0.8) is vulnerable to authorization bypass due to improper verification that a user is authorized to perform an action. This allows authenticated attackers with subscriber-level access and above to permanently delete arbitrary WordPress posts — including pages, courses, quizzes, and WooCommerce products — via wp_delete_post( $id, true ). The exploit chain requires triggering the profile-photo upload flow, creating a Tutor topic reparented to that attachment, then invoking the lesson deletion handler against any target post ID.

The Tutor LMS WordPress plugin before 4.0.8 does not check that a user has access to a course before returning its lesson discussion content. This allows any authenticated user, such as a subscriber, to read comments from courses they are not enrolled in, including comments awaiting moderation.

The Tutor LMS WordPress plugin before 4.0.8 does not correctly determine whether an incoming request is addressed to its own REST API, and does not enforce the permission recorded against an API credential. This allows the holder of a read-only key to act as the administrator account that issued it.