CVE-2026-81340: CWE-639 Authorization Bypass Through User-Controlled Key in MasterStudy LMS WordPress Plugin
The MasterStudy LMS WordPress Plugin before version 3.7.50 contains an authorization bypass vulnerability. This flaw allows users with the Instructor role to update any order via the REST API without proper ownership or capability checks. Exploitation can lead to unauthorized modifications such as granting free course enrollments, revoking paid enrollments of other users, and altering order notes.
AI Analysis
Technical Summary
CVE-2026-81340 is an authorization bypass vulnerability in the MasterStudy LMS WordPress Plugin versions prior to 3.7.50. The plugin fails to enforce per-object ownership or capability checks when processing order updates through its REST API. As a result, users assigned the Instructor role can manipulate orders they do not own, enabling unauthorized actions like free course enrollment and tampering with other users' paid orders.
Potential Impact
Users with the Instructor role can exploit this vulnerability to modify any order on the site, potentially granting themselves or others free access to paid courses, revoking legitimate enrollments, and altering order-related data. This compromises the integrity of course enrollment and payment records within the LMS.
Mitigation Recommendations
Patch to version 3.7.50 or later where this vulnerability is fixed. Since no official patch links are provided, users should monitor the vendor's site or trusted plugin repositories for the update. Until patched, restrict the Instructor role permissions or disable the REST API endpoints related to order updates if feasible.
CVE-2026-81340: CWE-639 Authorization Bypass Through User-Controlled Key in MasterStudy LMS WordPress Plugin
Description
The MasterStudy LMS WordPress Plugin before version 3.7.50 contains an authorization bypass vulnerability. This flaw allows users with the Instructor role to update any order via the REST API without proper ownership or capability checks. Exploitation can lead to unauthorized modifications such as granting free course enrollments, revoking paid enrollments of other users, and altering order notes.
Affected software
MasterStudy LMS WordPress Plugin
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-81340 is an authorization bypass vulnerability in the MasterStudy LMS WordPress Plugin versions prior to 3.7.50. The plugin fails to enforce per-object ownership or capability checks when processing order updates through its REST API. As a result, users assigned the Instructor role can manipulate orders they do not own, enabling unauthorized actions like free course enrollment and tampering with other users' paid orders.
Potential Impact
Users with the Instructor role can exploit this vulnerability to modify any order on the site, potentially granting themselves or others free access to paid courses, revoking legitimate enrollments, and altering order-related data. This compromises the integrity of course enrollment and payment records within the LMS.
Mitigation Recommendations
Patch to version 3.7.50 or later where this vulnerability is fixed. Since no official patch links are provided, users should monitor the vendor's site or trusted plugin repositories for the update. Until patched, restrict the Instructor role permissions or disable the REST API endpoints related to order updates if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-08-26T18:07:36.343Z
- State
- PUBLISHED
Threat ID: 6aacd5a155bf5e2cf5955f12
Added to database: 09/18/2026, 06:09:37 UTC
Last enriched: 09/18/2026, 06:31:35 UTC
Last updated: 09/18/2026, 06:41:42 UTC
Views: 2
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