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4.3

Tutor LMS lets instructors alter or erase any quiz content

CVE-2026-18439 · published 1 month ago
Summary

The Tutor LMS plugin for WordPress (up to version 4.0.7) does not properly check who owns a quiz question or answer when an instructor saves changes. Because of this, an instructor who is signed in can change or delete questions and answers that belong to other teachers or administrators, potentially corrupting course material. Update the plugin to the latest release (or apply the vendor’s security patch) and restrict instructor permissions if possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
themeum tutor lms – elearning and online course solution <= 4.0.7
Original advisory text
Tutor LMS <= 4.0.7 - Authenticated (Custom+) Insecure Direct Object Reference to Arbitrary Quiz Question/Answer Modification and Deletion via 'payload' Parameter
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 4.0.7 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 in the submitted payload belong to a quiz/topic/course the requester is authorized to manage. The handler only validates the top-level course_id, topic_id, and (when supplied) payload['ID'], but the nested identifiers are passed straight into $wpdb->update/DELETE statements in QuizBuilder::save_questions(), QuizBuilder::save_question_answers(), and QuizBuilder::handle_delete(). This makes it possible for authenticated attackers, with Instructor-level access and above, to overwrite the content and re-parent arbitrary quiz questions/answers belonging to other instructors or administrators, and to delete arbitrary quiz question and answer rows.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
4.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-639Authorization Bypass Through User-Controlled Key
Timeline
Published22 Sep 2026
Updated4 Nov 2026
First seen22 Sep 2026
Sources
CVE-2026-18439 · NVD
CVE-2026-18439 · MITRE
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