CVE-2025-59577

MasterStudy LMS <= 3.6.20 - Authenticated (Subscriber+) Race Condition to Multiple Reviews

2025-09-22 00:00

Strategic Overview

Status: Patched in 3.6.21
Affected Plugin: MasterStudy LMS WordPress Plugin – for Online Courses and Education
Affected Version: <= 3.6.20
CVSS: 4.3Medium
Weakness type: CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVE: CVE-2025-59577

View all MasterStudy LMS WordPress Plugin – for Online Courses and Education vulnerabilities

At a glance

CVE-2025-59577 is a medium-severity Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in the MasterStudy LMS WordPress Plugin WordPress plugin, affecting versions <= 3.6.20. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 3.6.21; sites on affected versions should update now. Disclosed September 2025, reported by Bibek Dhakal.

Vulnerability Overview

The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to a race condition in all versions up to, and including, 3.6.20. This makes it possible for authenticated attackers, with Subscriber-level access and above, to leave multiple reviews on a course.

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-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Remediation

Update to version 3.6.21, or a newer patched version

How does WordSec protect against this?

The fix is the thing that ends this: MasterStudy LMS WordPress Plugin 3.6.21 closes this, and updating the plugin is the step that ends it.

Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2025-59577 https://www.wordfence.com/threat-intel/vulnerabilities/id/1f404b2f-536d-4549-b74b-90b8bbd0edae https://nvd.nist.gov/vuln/detail/CVE-2025-59577

Related records

Other vulnerabilities in MasterStudy LMS WordPress Plugin – for Online Courses and Education

CVSS Vector

4.3

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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