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CVE-2026-81340— MasterStudy LMS < 3.7.50 - Instructor+ Order Status Manipulation via IDOR

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 3.7.50 版本之前，通过其 REST API 更新订单时未执行针对特定对象的归属权或权限检查。这使得具有 Instructor（讲师）角色的用户可以修改站点上的任意订单，从而获得免费课程注册权限、撤销其他用户已付费的课程注册，以及篡改订单备注。

AI Predicted 7.5 Difficulty: Easy EPSS 0.32% · P25

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-2026-81340

Vulnerability Information
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Vulnerability Title
MasterStudy LMS < 3.7.50 - Instructor+ Order Status Manipulation via IDOR
Source: CVE Program / CVE List V5
Vulnerability Description
The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not perform per-object ownership or capability checks when updating orders through its REST API, allowing users with the Instructor role to modify any order on the site, granting free course enrolment, revoking other users' paid enrolments, and tampering with order notes.
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-2026-81340

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III. Intelligence Information for CVE-2026-81340

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Other References for CVE-2026-81340 (1)

Same Patch Batch · Unknown · 2026-09-18 · 32 CVEs total

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CVE-2026-90977 5.3 MEDIUM Clean Login < 1.19 - Unauthenticated CAPTCHA Bypass via Empty Session Comparison
CVE-2026-90976 5.3 MEDIUM Clean Login < 1.19 - Unauthenticated Account Creation with Registration Disabled
CVE-2026-86800 5.3 MEDIUM WP Ghost (Hide My WP Ghost) < 7.0.11 - Unauthenticated URL Hiding Bypass via Loopback Comp
CVE-2026-86796 5.3 MEDIUM WP Ghost (Hide My WP Ghost) 7.0.10 - Unauthenticated Firewall, Threat Detection and URL Hi
CVE-2026-87770 Price Drop Alert for WooCommerce <= 1.1 - Unauthenticated SQL Injection via product
CVE-2026-90978 Filter Gallery < 1.1.5 - Subscriber+ Arbitrary Post Overwrite and Plugin Option Deletion v
CVE-2026-90984 Generate PDF using Contact Form 7 < 4.2.2 - Unauthenticated Server-Side Request Forgery vi
CVE-2026-89008 Bookit < 2.6.0.5 - Bookit Staff+ Appointment PII Disclosure
CVE-2026-89007 Bookit < 2.6.0.5 - Bookit Staff+ Arbitrary Appointment Deletion via Missing Authorization
CVE-2026-87966 Easy Appointments 4.0 - 4.0.2.1 - Unauthenticated Arbitrary Appointment Modification and D
CVE-2026-88825 iGMS Direct Booking < 2.0 - Unauthenticated Stored XSS via Widget Settings
CVE-2026-88798 Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofe
CVE-2026-88993 All Bootstrap Blocks <= 1.3.31 - Contributor+ Stored XSS via areoi/button type Attribute
CVE-2026-88844 MasterStudy LMS 3.6.2 - < 3.7.50 - Instructor+ Student PII Disclosure via IDOR
CVE-2026-81810 All-in-One WP Migration and Backup < 7.111 - Authenticated Privilege Escalation to Admin v
CVE-2026-87775 Tz Weekly Radio Schedule <= 1.8.1 - Unauthenticated SQLi via tzwrs_update_cell
CVE-2026-87771 Product Question and Answer <= 1.1.0 - Unauthenticated SQL Injection via p_id and read
CVE-2026-87774 Tz Weekly Radio Schedule <= 1.8.1 - Unauthenticated SQL Injection via week

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MasterStudy LMS WordPress Plugin
Same vendor: Unknown