CVE-2026-81338: CWE-345 Insufficient Verification of Data Authenticity in MasterStudy LMS WordPress Plugin
The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not properly sanitise and restrict HTML in user-submitted content before storing it and rendering it to other users, allowing users with subscriber-level accounts and above to perform stored HTML injection, such as embedding iframes, that can be leveraged for phishing and content spoofing against other users viewing the content.
AI Analysis
Technical Summary
CVE-2026-81338 is a vulnerability in the MasterStudy LMS WordPress Plugin versions prior to 3.7.50. The plugin fails to properly sanitize and restrict HTML in user-submitted content before storing and rendering it to other users. This insufficient verification of data authenticity (CWE-345) enables users with subscriber-level permissions or above to perform stored HTML injection, such as embedding malicious iframes. This flaw can be exploited to conduct phishing and content spoofing attacks targeting other users of the plugin.
Potential Impact
Users with subscriber-level accounts or higher can inject malicious HTML content that is stored and displayed to other users. This can lead to phishing attacks and content spoofing, potentially compromising user trust and security within the affected WordPress site.
Mitigation Recommendations
A fix is available in MasterStudy LMS WordPress Plugin version 3.7.50. Users should upgrade to version 3.7.50 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-81338: CWE-345 Insufficient Verification of Data Authenticity in MasterStudy LMS WordPress Plugin
Description
The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not properly sanitise and restrict HTML in user-submitted content before storing it and rendering it to other users, allowing users with subscriber-level accounts and above to perform stored HTML injection, such as embedding iframes, that can be leveraged for phishing and content spoofing against other users viewing the content.
CVSS v3.1
Score 4.6medium
Affected software
MasterStudy LMS WordPress Plugin
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-81338 is a vulnerability in the MasterStudy LMS WordPress Plugin versions prior to 3.7.50. The plugin fails to properly sanitize and restrict HTML in user-submitted content before storing and rendering it to other users. This insufficient verification of data authenticity (CWE-345) enables users with subscriber-level permissions or above to perform stored HTML injection, such as embedding malicious iframes. This flaw can be exploited to conduct phishing and content spoofing attacks targeting other users of the plugin.
Potential Impact
Users with subscriber-level accounts or higher can inject malicious HTML content that is stored and displayed to other users. This can lead to phishing attacks and content spoofing, potentially compromising user trust and security within the affected WordPress site.
Mitigation Recommendations
A fix is available in MasterStudy LMS WordPress Plugin version 3.7.50. Users should upgrade to version 3.7.50 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-08-26T18:07:02.182Z
- State
- PUBLISHED
Threat ID: 6ab36d3df7a7c541065abc95
Added to database: 09/23/2026, 06:10:05 UTC
Last enriched: 09/23/2026, 06:33:27 UTC
Last updated: 09/24/2026, 02:17:35 UTC
Views: 9
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