CVE-2026-81026— MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN
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.
MasterStudy LMS WordPress 插件在 3.7.40 版本之前存在安全漏洞：该插件在将对应订单标记为已完成时，并未验证支付通知中的金额、收款方、币种或状态。这使得未认证的用户只需支付一个极小的金额（token 金额），即可将全额订单标记为已完成，从而获取付费内容的使用权限。
Possible ATT&CK Techniques 1 AI
T1529 · System Shutdown/RebootAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Unknown | MasterStudy LMS WordPress Plugin | < 3.7.40 |
affected |
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I. Basic Information for CVE-2026-81026
Vulnerability Information
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Vulnerability Title
MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN
Source: CVE Program / CVE List V5
Vulnerability Description
The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.40 does not verify the amount, receiver, currency or status of a payment notification before marking the corresponding order completed, allowing unauthenticated users to complete full-price orders and gain access to paid content by paying only a token amount.
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 ~ 3.7.40 | - |
|
II. Public POCs for CVE-2026-81026
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-81026 (1)
-
🔗 MasterStudy LMS < 3.7.40 – Unauthenticated Payment Bypass via PayPal IPN | CVE 2026-81026 | Plugin Vulnerabilities exploit vdb-entry technical-description
Same Patch Batch · Unknown · 2026-08-29 · 26 CVEs total
| CVE-2026-76547 | Profile Builder < 4.0.1 - Admin+ PHP Object Injection via Import/Export | |
| CVE-2026-81200 | MasterStudy LMS < 3.7.42 - Instructor+ Cross-Tenant Order Billing PII Disclosure via IDOR | |
| CVE-2026-81342 | MasterStudy LMS < 3.7.43 - Unauthenticated Open Redirect | |
| CVE-2026-81346 | Frontend Admin by DynamiApps < 3.29.11 - Subscriber+ Arbitrary Membership Plan Deletion | |
| CVE-2026-80311 | Stripe Payment Forms by WP Full Pay < 8.5.5 - Cross-Customer Subscription Cancellation via | |
| CVE-2026-80488 | WP Ultimate CSV Importer < 9.0 - Admin+ SQLi via AIOSEO Import Fields | |
| CVE-2026-77704 | Amelia 1.2.32 - 2.4.8 - Amelia Customer+ Appointment Status Update and Self-Approval | |
| CVE-2026-77786 | Rank Math SEO < 1.0.277 - Editor+ Core Settings Modification via fix-site-seo Ability | |
| CVE-2026-76586 | BookingPress 1.5.6 - 1.6.2 - Unauthenticated Booking Price Manipulation via PayPal Payment | |
| CVE-2026-77010 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated Moderator Jo | |
| CVE-2026-77012 | Icollect <= 1.0.0 - Unauthenticated Arbitrary File Read, SSRF and Path Traversal File Writ | |
| CVE-2026-77008 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated Plugin Setti | |
| CVE-2026-77007 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated BigBlueButto | |
| CVE-2026-16259 | Uix UserCenter <= 1.0.3 - Unauthenticated Privilege Escalation | |
| CVE-2026-76548 | Profile Builder < 4.0.1 - Unauthenticated Unpublished Content and Media Modification via F | |
| CVE-2026-17520 | Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key | |
| CVE-2026-17522 | Newsletters < 4.17 - Arbitrary Plugin Option Update via CSRF | |
| CVE-2026-76546 | Profile Builder < 4.0.1 - Contributor+ Stored XSS via Format Date Shortcode | |
| CVE-2026-19430 | CatFolders Document Gallery Pro < 2.0.7 - Unauthenticated Missing Authorization via downlo | |
| CVE-2026-18234 | MStore API < 4.21.1 - Subscriber+ Arbitrary Order Payment Bypass via Wallet |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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V. Comments for CVE-2026-81026
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