CVE-2026-81342

MasterStudy LMS WordPress Plugin – for Online Courses and Education < 3.7.43 - Unauthenticated Open Redirect

2026-08-27 00:00
Abiodun Victor

Strategic Overview

Status
Patched in 3.7.43
Affected Plugin
MasterStudy LMS WordPress Plugin – for Online Courses and Education
Affected Version
< 3.7.43
CVSS
7.2High
Weakness type
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE
CVE-2026-81342
View all MasterStudy LMS WordPress Plugin – for Online Courses and Education vulnerabilities

At a glance

CVE-2026-81342 is a high-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the MasterStudy LMS WordPress Plugin WordPress plugin, affecting versions < 3.7.43. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.7.43; sites on affected versions should update now. Disclosed August 2026, reported by Abiodun Victor.

Vulnerability Overview

The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to Open Redirect in all versions up to 3.7.43 (exclusive). This is due to insufficient validation on the redirect url supplied. This makes it possible for unauthenticated attackers to redirect users to potentially malicious sites if they can successfully trick them into performing an action.

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-601: URL Redirection to Untrusted Site ('Open Redirect')

Reaching this weakness in MasterStudy LMS WordPress Plugin < 3.7.43 takes no account at all. An open redirect is a page that takes a destination from the request and sends the browser there without checking that the destination belongs to the site.

A link that starts on a trusted domain finishes on an attacker's, which is what makes phishing and consent-screen abuse credible to the person clicking it. For MasterStudy LMS WordPress Plugin the fix is 3.7.43: builds < 3.7.43 are affected, anything from 3.7.43 onward is not.

Remediation

Update to version 3.7.43, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: MasterStudy LMS WordPress Plugin 3.7.43 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-81342https://www.wordfence.com/threat-intel/vulnerabilities/id/c1b1418e-3ec4-479c-b607-1ea394d630fehttps://nvd.nist.gov/vuln/detail/CVE-2026-81342

Related records

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