CVE-2026-81342

Deferred Deferred - Pending Action

Unauthenticated URL Redirection in MasterStudy LMS WordPress Plugin

Publication date: 2026-08-29

Last updated on: 2026-08-30

Assigner: WPScan

Description

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.43 does not validate a redirect parameter supplied during user registration before using it, allowing unauthenticated attackers to redirect users to arbitrary external URLs.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-29

Last Modified

2026-08-30

Generated

2026-09-18

AI Q&A

2026-08-29

EPSS Evaluated

2026-09-15

NVD

CVE-2026-81342

EUVD

EUVD-2026-68064

Affected Vendors & Products

Vendor	Product	Version / Range
masterstudy	lms	to 3.7.43 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-601	The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Attack-Flow Graph

Executive Summary

The MasterStudy LMS WordPress Plugin before version 3.7.43 has an unauthenticated open redirect vulnerability. During user registration, the plugin does not validate a redirect parameter, allowing attackers to send users to any external website without authentication.

Detection Guidance

To detect this vulnerability, check if your WordPress site uses the MasterStudy LMS plugin version prior to 3.7.43. Inspect the user registration page for unvalidated redirect parameters in URLs. Look for suspicious external redirects during registration attempts.

Impact Analysis

This vulnerability can trick users into visiting malicious websites, leading to phishing attacks, malware downloads, or credential theft. Users may unknowingly expose sensitive information if they follow the malicious redirect.

Compliance Impact

This vulnerability could lead to data breaches or unauthorized access, violating GDPR and HIPAA requirements for protecting user data. Organizations using the vulnerable plugin may face compliance penalties and reputational damage.

Mitigation Strategies

Immediately update the MasterStudy LMS plugin to version 3.7.43 or later. If updating is not possible, consider disabling the plugin until the update is applied. Monitor user registration logs for unusual redirect activities.

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