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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。

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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

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III. Intelligence Information for CVE-2026-81026

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Other References for CVE-2026-81026 (1)

Same Patch Batch · Unknown · 2026-08-29 · 26 CVEs total

CVE-2026-76548 Profile Builder < 4.0.1 - Unauthenticated Unpublished Content and Media Modification via F
CVE-2026-10522 Simple User Registration <= 6.9 - Unauthenticated Privilege Escalation to Administrator
CVE-2026-16061 Rest Routes <= 5.5.5 - Unauthenticated SQLi via custom-tables/tables/{table_name}
CVE-2026-16947 Total Processing Card Payments for WooCommerce <= 7.3 - Unauthenticated SSRF leading to Pa
CVE-2026-16600 SmartAIPress <= 1.2.0 - Subscriber+ Server-Side Request Forgery via smartaipress_openai_up
CVE-2026-16259 Uix UserCenter <= 1.0.3 - Unauthenticated Privilege Escalation
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
CVE-2026-18233 MStore API < 4.21.1 - Subscriber+ Arbitrary Order Completion
CVE-2026-76547 Profile Builder < 4.0.1 - Admin+ PHP Object Injection via Import/Export
CVE-2026-81346 Frontend Admin by DynamiApps < 3.29.11 - Subscriber+ Arbitrary Membership Plan Deletion
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-2026-80311 Stripe Payment Forms by WP Full Pay < 8.5.5 - Cross-Customer Subscription Cancellation via

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MasterStudy LMS WordPress Plugin
Same vendor: Unknown

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