EUVD-2026-39755
GHSA-48jq-5gpf-vwj9
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Subscriber account (PR:L) is the sole access requirement; endpoint is network-reachable with no special conditions; only limited integrity impact is evident with no confidentiality or availability effect.
Primary rating from Vendor (patchstack).
CVSS VectorVendor: patchstack
Lifecycle Timeline
1DescriptionCVE.org
Subscriber Broken Access Control in MasterStudy LMS <= 3.7.30 versions.
AnalysisAI
Broken Access Control in the MasterStudy LMS WordPress plugin (versions ≤ 3.7.30) permits authenticated subscriber-level users to perform actions that exceed their intended permissions. Rooted in CWE-862 (Missing Authorization), the plugin fails to enforce capability checks on one or more endpoints, allowing low-privileged registered users to make unauthorized integrity-affecting modifications. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog, though the low complexity and network accessibility make it straightforward to exploit on sites with open user registration.
Technical ContextAI
MasterStudy LMS is a WordPress learning management system plugin developed by StylemixThemes, providing course creation, student enrollment, and quiz management functionality. CWE-862 (Missing Authorization) identifies the root cause: the plugin executes privileged operations - likely via WordPress AJAX handlers or REST API endpoints - without verifying the requesting user holds the required WordPress capability. In the WordPress role model, 'subscriber' is the lowest authenticated role, typically granted to any self-registered site visitor. The CVSS vector (PR:L) confirms that subscriber-level access is sufficient, meaning the plugin does not restrict these operations to roles such as instructor, editor, or administrator. The integrity impact (I:L) suggests the unauthorized actions involve modifying data within the plugin's scope, such as course content, enrollment records, or quiz results.
RemediationAI
Update the MasterStudy LMS plugin to a version above 3.7.30; the exact patched release should be verified through the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/masterstudy-lms-learning-management-system/vulnerability/wordpress-masterstudy-lms-plugin-3-7-30-broken-access-control-vulnerability or the official WordPress plugin repository, as the specific fixed version was not confirmed in the available intelligence. As a compensating control prior to patching, administrators should disable open user registration (Settings > General > uncheck 'Anyone can register' in WordPress) to prevent unauthenticated threat actors from obtaining the subscriber account needed to exploit this flaw - note this will prevent new learner self-enrollment as a side effect. Additionally, auditing existing subscriber accounts for unexpected or suspicious users reduces the pool of potential internal exploiters. A Web Application Firewall (WAF) with WordPress-aware rulesets may detect anomalous requests to plugin endpoints, though this should not substitute for patching.
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today