WordPressプラグイン「Tutor LMS – eLearning and online course solution」にユーザー制御の鍵による認可回避（IDOR）の脆弱性（CVE-2026-18439）
概要
WordPressプラグイン「Tutor LMS – eLearning and online course solution」にユーザー制御の鍵による認可回避（IDOR）の脆弱性が確認されました。
バージョン 4.0.7 以前に影響があります。
修正版 4.0.8 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-18439 WF-6d07c82d-262a-4ac1-9ee5-7ef4d025f66f |
|---|---|
| 脆弱性の種類 | ユーザー制御の鍵による認可回避（IDOR） |
| 危険度 | 中 |
| CVSSスコア |
4.3（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| 公開日 | 2026年9月21日 |
| 更新日 | 2026年9月22日 |
影響を受ける製品
| 製品 | 影響を受けるバージョン | 修正版 | 出典 |
|---|---|---|---|
| WordPressプラグイン「Tutor LMS – eLearning and online course solution」 |
4.0.7 以前 | 4.0.8 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Tutor LMS – eLearning and online course solution」を修正版 4.0.8 またはそれ以降の公式最新版へ更新してください。
情報元の原文
Wordfence Intelligence
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.
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