CVE-2026-68568 in Masterstudy Lms Plugin
Summary
by MITRE • 08/18/2026
Subscriber Privilege Escalation in MasterStudy LMS <= 3.7.41 versions.
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Analysis
by VulDB Data Team • 08/18/2026
The vulnerability identified as Subscriber Privilege Escalation in MasterStudy Learning Management System (LMS) prior to version 3.7.42 represents a critical security flaw that allows unauthorized users to elevate their privileges within the application environment. This issue stems from insufficient access control mechanisms embedded within the plugin's architecture, specifically affecting how user roles and capabilities are validated during administrative operations. In WordPress-based ecosystems such as MasterStudy LMS, role management is fundamental to maintaining system integrity, ensuring that only authenticated administrators can perform sensitive tasks like modifying course structures, managing student data, or altering site configurations. When these checks are bypassed, the boundary between low-privilege users and high-privilege administrators collapses, leading to a complete compromise of the application's security model.
From a technical perspective, this flaw is classified under CWE-269, which denotes Improper Privilege Management. The vulnerability likely arises from a failure to verify that the requesting user possesses the necessary capabilities before executing administrative functions or modifying critical database records. In many cases involving LMS platforms, such vulnerabilities are triggered through specific API endpoints or form submissions where the backend logic relies on client-side assumptions rather than server-side validation of user roles. An attacker with a subscriber-level account, which is typically the lowest level of access granted to students or casual visitors, can craft malicious requests that exploit this oversight. By manipulating parameters in HTTP requests directed at administrative pages or AJAX handlers, the attacker instructs the application to perform actions reserved for administrators without triggering any authorization errors.
The operational impact of this vulnerability is severe and multifaceted. Once an attacker successfully escalates their privileges from subscriber to administrator, they gain full control over the WordPress installation hosting MasterStudy LMS. This level of access allows the adversary to install malicious plugins or themes, modify core files, inject persistent backdoors, and exfiltrate sensitive student data including personally identifiable information (PII), payment details, and academic records. Furthermore, an attacker with administrative rights can alter course content, manipulate grades, or delete critical educational materials, thereby disrupting the learning process for all users of the platform. The compromise extends beyond the immediate application, as WordPress administrators often have access to server-level configurations, potentially leading to broader network infiltration if proper isolation practices are not enforced between web applications and other services on the same host.
This type of vulnerability aligns with several tactics in the MITRE ATT&CK framework for enterprise security. Specifically, it relates to T1078 Valid Accounts, where attackers use legitimate credentials that have been escalated or misused to gain unauthorized access. Additionally, the exploitation method often involves T1190 Exploit Public-Facing Application, as LMS platforms are frequently exposed to the internet and serve as entry points for initial compromise. The privilege escalation aspect also mirrors techniques described in T1068 Exploitation for Privilege Escalation, highlighting how attackers leverage software flaws to move laterally or gain higher levels of control within a compromised environment. Understanding these mappings is crucial for security teams aiming to detect and mitigate such threats through behavioral analytics and endpoint detection systems.
To remediate this vulnerability, organizations running MasterStudy LMS must immediately update the plugin to version 3.7.42 or any later release where the access control logic has been corrected by the developers. It is imperative to verify that all instances of the software are patched across staging and production environments simultaneously to prevent exploitation during maintenance windows. Beyond immediate patching, administrators should implement strict input validation and enforce server-side role verification for every administrative action performed through the application interface. Implementing a Web Application Firewall (WAF) can provide an additional layer of defense by blocking known exploit patterns associated with privilege escalation attempts. Regular security audits and penetration testing focused on access control mechanisms are recommended to identify similar weaknesses in custom code or third-party integrations that may share the same architectural flaws.