Tutor LMS <= 4.0.7 — Authenticated (Custom+) Insecure Direct Object Reference to Arbitrary Quiz Question/Answer Modification and Deletion via 'payload' Parameter
CVE-2026-18439Published · Updated Action summary
Affected: ≤4.0.7Update to 4.0.8 or newer
All remediation steps- Severity
- Medium4.3
- CVSS
- 4.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Tutor LMS – eLearning and online course solution tutor
- Affected≤ 4.0.7
- Patched in4.0.8
Update to 4.0.8 or newer.
You are affected if you run ≤ 4.0.7. Version 4.0.8 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Tutor LMS – eLearning and online course solution.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 4.0.8, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Tutor LMS – eLearning and online course solution to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Nakul Chodha.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Tutor LMS – eLearning and online course solution
All 102| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.5 | Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Exposure via REST API Endpoints ≤4.1.2Update to 4.1.3 | CVE-2026-93779 | |
| Medium4.3 | 4.1.3 - Authenticated (Subscriber+) Information Exposure 1.6.4 – 4.1.3Update to 4.2.0 | CVE-2026-85570 | |
| Medium6.4 | Authenticated (Subscriber+) Stored Cross-Site Scripting ≤4.1.2Update to 4.1.3 | CVE-2026-111407 | |
| Medium4.3 | Insecure Direct Object Reference to Authenticated (Author+) Arbitrary Course Modification and Ownership Takeover via 'ID' Parameter ≤4.1.0Update to 4.1.1 | CVE-2026-92715 | |
| Medium6.4 | Authenticated (Subscriber+) Stored Cross-Site Scripting via display_name Parameter ≤4.1.0Update to 4.1.1 | CVE-2026-93681 |
- Medium6.5Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Exposure via REST API Endpoints
≤4.1.2Update to 4.1.3
- Medium4.34.1.3 - Authenticated (Subscriber+) Information Exposure
1.6.4 – 4.1.3Update to 4.2.0
- Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting
≤4.1.2Update to 4.1.3
- Medium4.3Insecure Direct Object Reference to Authenticated (Author+) Arbitrary Course Modification and Ownership Takeover via 'ID' Parameter
≤4.1.0Update to 4.1.1
- Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting via display_name Parameter
≤4.1.0Update to 4.1.1
Timeline
CVE published
Severity medium, CVSS 4.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.