MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course Discussions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81338
StatePUBLISHED
AssignerWPScan
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 06:17:02 UTC
Updated2026-09-23 18:13:31 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 4.6 MEDIUM from ADP

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

EPSS: 0.000930000 probability, percentile 0.005070000 (date 2026-09-24)

Problem Types: CWE-345 | CWE-345 Insufficient Verification of Data Authenticity | CWE-345 CWE-345 Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED4.6MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary4.6MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Unknown MasterStudy LMS WordPress Plugin affected 3.7.50 semver Not specified

References

ReferenceSourceLinkTags
wpscan.com/vulnerability/e8494c71-fb0f-4ab9-a8b7-8db3745a2d9b [email protected] wpscan.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jaime F. Murillo (en)

CNA: WPScan (en)

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