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CVE-2026-81338— MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course Discussions

Quick assessment

Affected
Unknown MasterStudy LMS WordPress Plugin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 sto

EPSS 0.14% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown MasterStudy LMS WordPress Plugin < 3.7.50 affected
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I. Basic Information for CVE-2026-81338

Vulnerability Information

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Vulnerability Title
MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course Discussions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown MasterStudy LMS WordPress Plugin 0 ~ 3.7.50 -

II. Public POCs for CVE-2026-81338

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III. Intelligence Information for CVE-2026-81338

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Other References for CVE-2026-81338 (1)

Same Patch Batch · Unknown · 2026-09-23 · 57 CVEs total

CVE-2026-86601 6.5 MEDIUM WP Recipe Maker < 10.8.2 - Unauthenticated Arbitrary Shortcode Execution via Comment Conte
CVE-2026-86612 5.6 MEDIUM Ninja Tables < 5.2.17 - Unauthenticated Arbitrary Shortcode Execution via Fluent Forms Dat
CVE-2026-90950 5.3 MEDIUM Paid Member Subscriptions < 3.1.0 - Unauthenticated reCAPTCHA Bypass via Registration Form
CVE-2026-87978 5.3 MEDIUM Paymob for WooCommerce < 4.1.14 - Unauthenticated Payment Bypass via Unverified Subscripti
CVE-2026-87071 5.3 MEDIUM Forminator Forms < 1.57.2.1 - Unauthenticated Post Meta Injection on Submitted Posts
CVE-2026-87070 5.3 MEDIUM Forminator Forms < 1.57.2.1 - Unauthenticated Poll Vote Limit Bypass via IP Spoofing
CVE-2026-84091 5.3 MEDIUM SUMIT Payment Gateway for WooCommerce < 4.0.0 - Unauthenticated Payment Confirmation Forge
CVE-2026-86604 4.8 MEDIUM GTranslate < 5.0.1 - Unauthenticated Arbitrary Shortcode Execution via Email Translation
CVE-2026-87848 3.7 LOW MPCX Lightbox 1.2.2 - 1.2.5 - Unauthenticated Non-Public Post Content Disclosure
CVE-2026-84046 Directorist < 8.9.5 - Subscriber+ SSRF via Avatar URL
CVE-2026-83555 Email Subscribers by Icegram Express < 5.9.35 - Unauthenticated Subscription Status Change
CVE-2026-84168 Easy Hide Login < 1.7 - Login Page Protection Bypass / Hidden URL Disclosure
CVE-2026-84742 The Events Calendar 6.15.0 - 6.17.4.1 - Contributor+ Content Publication via TEC V1 REST A
CVE-2025-15696 Real3D Flipbook Lite < 5.4 - Author+ Stored XSS
CVE-2026-84027 Directorist 8.9.1 - 8.9.4 - Subscriber+ Paid Order and Payment Record Forgery via REST Ord
CVE-2026-84098 Directorist 3.1.0 - 8.9.4 - Subscriber+ Arbitrary Listing Deletion via remove_listing
CVE-2026-84150 Directorist < 8.9.5 - Subscriber+ Cross-User Favorites Read and Write via REST Favorites E
CVE-2026-82843 WP OAuth Server < 6.4.0 - Subscriber+ Cross-User Account Takeover via OIDC ID Token Substi
CVE-2026-81339 MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR
CVE-2026-84743 The Events Calendar 6.15.16.1 - 6.17.4.1 - Contributor+ Event/Venue/Organizer Update, Tras

Showing top 20 of 57 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MasterStudy LMS WordPress Plugin
Same vendor: Unknown

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