CVE-2026-81338
📛 CVE Title
MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course Discussions
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.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- WPScan
- CVSS severity
- —
- CVSS score
- —
- CVSS vector
- —
- Effective score
- 4.6 / 10 MEDIUM source: NVD
- CWE(s)
-
CWE-345 Insufficient Verification of Data Authenticity - Reserved
- 2026-08-26
- Published
- 2026-09-23 06:00 UTC
- Last updated
- 2026-09-23 10:59 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/81xxx/CVE-2026-81338.json
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-09-23 06:17:02 UTC
- NVD last modified
- 2026-09-23 18:13:31 UTC
- NVD CVSS v3.1
- 4.6 / 10 MEDIUM source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N- Exploitability subscore
- 2.1 / 10
- Impact subscore
- 2.5 / 10
- EPSS score
- 0.0014 (probability of exploitation in next 30 days)
- EPSS percentile
- 3.52% vs all CVEs — higher = more likely to be exploited, as of 2026-09-23
NVD-assigned CWE(s):
CWE-345
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-09-24 04:34 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-85028 - Assigner
- WPScan
- Published
- Sep 23, 2026, 6:00:15 AM
- Updated
- Sep 23, 2026, 10:59:21 AM
- EUVD base score (CVSS 3.1)
-
4.6 / 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - EUVD-reported EPSS
- 0.1400
- Vendors
- Unknown
- Products
-
MasterStudy LMS WordPress Plugin (0 <3.7.50)
- Aliases
-
GHSA-xc92-96mw-2hrx
ENISA 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.
EUVD references (1)
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Unknown | MasterStudy LMS WordPress Plugin |
0 (affected)
|
— |
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- https://wpscan.com/vulnerability/e8494c71-fb0f-4ab9-a8b7-8db3745a2d9b/ exploitvdb-entrytechnical-description
Web references (0)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
No web references attached yet.
NVD-tagged references (1)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://wpscan.com/vulnerability/e8494c71-fb0f-4ab9-a8b7-8db3745a2d9b/ contact@wpscan.com
Remediations (10)
-
web:app.opencve.io
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 ...
2026-09-24 11:50 UTC -
web:cvetodo.com
CVE-2026-81338 vulnerability details and analysis. Full technical analysis, mitigations , and exploit status — updated in real time.
2026-09-24 11:50 UTC -
web:feedly.com
Sep 22, 2026 at 11:16 PM / Radar - Latest Security Threats CVE assignment NVD published the first details for CVE-2026-81338
2026-09-24 11:50 UTC -
web:msrc.microsoft.com
The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.
2026-09-24 11:50 UTC -
web:sec.cloudapps.cisco.com
On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...
2026-09-24 11:50 UTC -
web:senserva.com
Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.
2026-09-24 11:50 UTC -
web:support.microsoft.com
Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home. (See What version of Office am I using?) How to get and install the update Method 1: Microsoft Update This update is available from Microsoft Update. When you turn on ...
2026-09-24 11:50 UTC -
web:support.microsoft.com
This out-of-band (OOB) update for Windows 11, version 25H2 and Windows 11, version 24H2 (KB5121768) is cumulative. It includes all improvements from previous security and non-security updates, along with an additional fix . Improvements This OOB update includes the following improvement: [System Performance] This update addresses an issue affecting a limited number of devices with an Intel ...
2026-09-24 11:50 UTC -
web:www.tenable.com
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 ...
2026-09-24 11:50 UTC -
web:www.theregister.com
If you use WordPress, patch now. Just hours after fixes came out, attackers have begun exploiting two bugs that, when chained together, allow pre-authentication remote code execution (RCE). And security researchers tell us there's a very good chance the miscreants had an AI assist. "Once the vulnerabilities were publicly disclosed, reproducing them with the help of frontier AI models was ...
2026-09-24 11:50 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-81338.json.
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"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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"cna": {
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{
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"product": "MasterStudy LMS WordPress Plugin",
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}
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"source": {
"discovery": "EXTERNAL"
},
"title": "MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course Discussions",
"x_generator": {
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