CVE-2024-33939

Masteriyo - LMS <= 1.7.3 - Insecure Direct Object Reference

2024-04-30 00:00

Strategic Overview

Status: Patched in 1.7.4
Affected Plugin: Masteriyo LMS – LMS Course Builder, Quizzes & Certificates
Affected Version: <= 1.7.3
CVSS: 5.3Medium
Weakness type: CWE-639 · Authorization Bypass Through User-Controlled Key
CVE: CVE-2024-33939

View all Masteriyo LMS – LMS Course Builder, Quizzes & Certificates vulnerabilities

At a glance

CVE-2024-33939 is a medium-severity Authorization Bypass Through User-Controlled Key vulnerability in the Masteriyo LMS WordPress plugin, affecting versions <= 1.7.3. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.7.4; sites on affected versions should update now. Disclosed April 2024, reported by Steven Julian.

Vulnerability Overview

The Masteriyo LMS – eLearning and Online Course Builder for WordPress plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.7.3 via the REST API due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to view other users course progress.

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 privileges on the target site, and no interaction from a victim user.

CWE-639: Authorization Bypass Through User-Controlled Key

Reaching this weakness in Masteriyo LMS <= 1.7.3 takes a caller who can reach the endpoint. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.

Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. For Masteriyo LMS the fix is 1.7.4: builds <= 1.7.3 are affected, anything from 1.7.4 onward is not.

Remediation

Update to version 1.7.4, 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: Masteriyo LMS 1.7.4 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-33939 https://www.wordfence.com/threat-intel/vulnerabilities/id/0173e2a3-452d-490b-8ed7-a049a476d137 https://nvd.nist.gov/vuln/detail/CVE-2024-33939

Related records

Same weakness class

Other vulnerabilities in Masteriyo LMS – LMS Course Builder, Quizzes & Certificates

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityNone

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