CVE-2025-13766

MasterStudy LMS WordPress Plugin – for Online Courses and Education <= 3.7.6 Missing Authorization to Authenticated (Subscriber+) Posts and Media Creation, Modification and Deletion

2026-01-05 19:29
thinnawarth mathuros

Strategic Overview

Status
Patched in 3.7.7
Affected Plugin
MasterStudy LMS WordPress Plugin – for Online Courses and Education
Affected Version
<= 3.7.6
CVSS
5.4Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2025-13766
View all MasterStudy LMS WordPress Plugin – for Online Courses and Education vulnerabilities

At a glance

CVE-2025-13766 is a medium-severity Missing Authorization vulnerability in the MasterStudy LMS WordPress Plugin WordPress plugin, affecting versions <= 3.7.6. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 3.7.7; sites on affected versions should update now. Disclosed January 2026, reported by thinnawarth mathuros.

Vulnerability Overview

The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to unauthorized modification and deletion of data due to a missing capability checks on multiple REST API endpoints in all versions up to, and including, 3.7.6. This makes it possible for authenticated attackers, with Subscriber-level access and above, to upload or delete arbitrary media files, delete or modify posts, and create/manage course templates

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in MasterStudy LMS WordPress Plugin <= 3.7.6 takes an account at Subscriber level or above. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For MasterStudy LMS WordPress Plugin the fix is 3.7.7: builds <= 3.7.6 are affected, anything from 3.7.7 onward is not.

Remediation

Update to version 3.7.7, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: MasterStudy LMS WordPress Plugin 3.7.7 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2025-13766https://www.wordfence.com/threat-intel/vulnerabilities/id/2719739a-90dc-470b-9270-8578e0cead59https://nvd.nist.gov/vuln/detail/CVE-2025-13766

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C