Knight Squad Academy
Vulnerability advisory

CVE-2026-5060

Research by Md. Moniruzzaman Prodhan July 29, 2026
Overview

Summary

The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.7.14. This is due to the `stm_lms_delete_cover()` function lacking ownership validation on the `file_id` parameter before passing it to `wp_delete_attachment()`. This makes it possible for authenticated attackers, with Instructor-level access and above, to delete arbitrary attachments belonging to any user by enumerating sequential attachment IDs.

Risk profile

CVSS assessment

6.5 · M E D I U M
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
N E T W O R K
Complexity
L O W
Privileges
L O W
User interaction
N O N E
Scope
U N C H A N G E D
Confidentiality
N O N E
Integrity
H I G H
Availability
N O N E
Classification

Weaknesses

  • Authorization Bypass Through User-Controlled Key CWE-639
Further reading

References

4 sources
  1. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.14/_core/lms/classes/user.php#L2093
  2. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.14/_core/lms/classes/user.php#L2107
  3. plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3501788%40masterstudy-lms-learning-management-system%2Ftrunk&old=3496678%40masterstudy-lms-learning-management-system%2Ftrunk&sfp_email=&sfph_mail=
  4. www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/de11c9ad-0b9f-4934-8dc9-dc324d77d702?source=cve