CVE-2026-81339: CWE-639 Authorization Bypass Through User-Controlled Key in MasterStudy LMS WordPress Plugin
The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not perform a per-object ownership check when returning a quiz attempt result, allowing any authenticated user with a minimal (subscriber) role to read other students' quiz grades, pass/fail status and attempt timestamps by referencing an attempt identifier belonging to another user.
AI Analysis
Technical Summary
CVE-2026-81339 is an authorization bypass vulnerability in the MasterStudy LMS WordPress Plugin versions prior to 3.7.50. The plugin fails to perform per-object ownership checks when returning quiz attempt results. As a result, any authenticated user with minimal privileges can access quiz attempt data belonging to other users by referencing their attempt identifiers. This vulnerability is categorized under CWE-639 (Authorization Bypass Through User-Controlled Key).
Potential Impact
The vulnerability allows unauthorized disclosure of sensitive student data such as quiz grades, pass/fail status, and timestamps of quiz attempts. This breach of confidentiality could undermine user privacy and trust in the LMS platform. There is no indication of code execution or privilege escalation beyond data exposure.
Mitigation Recommendations
Upgrade the MasterStudy LMS WordPress Plugin to version 3.7.50 or later, where this authorization bypass vulnerability has been fixed. No other mitigation steps are indicated. Patch status is confirmed by the version range affected and the fixed version 3.7.50.
CVE-2026-81339: CWE-639 Authorization Bypass Through User-Controlled Key in MasterStudy LMS WordPress Plugin
Description
The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not perform a per-object ownership check when returning a quiz attempt result, allowing any authenticated user with a minimal (subscriber) role to read other students' quiz grades, pass/fail status and attempt timestamps by referencing an attempt identifier belonging to another user.
CVSS v3.1
Score 4.3medium
Affected software
MasterStudy LMS WordPress Plugin
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-81339 is an authorization bypass vulnerability in the MasterStudy LMS WordPress Plugin versions prior to 3.7.50. The plugin fails to perform per-object ownership checks when returning quiz attempt results. As a result, any authenticated user with minimal privileges can access quiz attempt data belonging to other users by referencing their attempt identifiers. This vulnerability is categorized under CWE-639 (Authorization Bypass Through User-Controlled Key).
Potential Impact
The vulnerability allows unauthorized disclosure of sensitive student data such as quiz grades, pass/fail status, and timestamps of quiz attempts. This breach of confidentiality could undermine user privacy and trust in the LMS platform. There is no indication of code execution or privilege escalation beyond data exposure.
Mitigation Recommendations
Upgrade the MasterStudy LMS WordPress Plugin to version 3.7.50 or later, where this authorization bypass vulnerability has been fixed. No other mitigation steps are indicated. Patch status is confirmed by the version range affected and the fixed version 3.7.50.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-08-26T18:07:09.452Z
- State
- PUBLISHED
Threat ID: 6ab36d3ff7a7c541065abc9b
Added to database: 09/23/2026, 06:10:07 UTC
Last enriched: 09/23/2026, 06:33:22 UTC
Last updated: 09/24/2026, 03:13:49 UTC
Views: 7
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