CVE-2026-8279 in LMS Plugin
Summary
by MITRE • 09/07/2026
The Masteriyo LMS plugin for WordPress is vulnerable to unauthorized data deletion due to a missing capability check on the 'delete_item_permissions_check' function in the CourseProgressItemsController in all versions up to, and including, 2.2.0. This makes it possible for unauthenticated attackers to delete arbitrary course progress records belonging to any student.
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Analysis
by VulDB Data Team • 09/07/2026
The Masteriyo Learning Management System plugin for WordPress contains a critical security flaw that allows unauthorized actors to manipulate or destroy educational data within the platform. Specifically, vulnerability exists in the CourseProgressItemsController class, which handles operations related to tracking and managing student progress through courses. The root cause of this issue is a missing capability check on the delete_item_permissions_check function across all versions up to and including 2.2.0. This oversight means that the system does not verify whether the user initiating the deletion request possesses the necessary administrative or instructor privileges before executing the command. Consequently, any individual with access to the WordPress installation can exploit this endpoint without needing valid credentials, classifying it as an unauthenticated attack vector.
From a technical perspective, the absence of proper authorization logic represents a fundamental failure in implementing secure design principles. In web application development, every action that modifies state or deletes data must be protected by robust authentication and authorization mechanisms. Here, the delete_item_permissions_check function serves as the gatekeeper for removing course progress records but fails to validate user roles against WordPress capabilities such as manage_options or edit_posts. This allows attackers to craft malicious HTTP requests targeting specific API endpoints associated with this controller. By sending these crafted requests, an attacker can trigger the deletion of arbitrary student progress data without triggering any security warnings or access denials from the application framework.
The operational impact of this vulnerability is severe for educational institutions and online course providers relying on Masteriyo to track learner engagement and completion rates. Course progress records are essential metrics used by instructors to assess student performance, identify those who may need additional support, and generate reports for accreditation or compliance purposes. The ability of an unauthenticated attacker to delete these records arbitrarily can lead to significant data loss, disrupting the academic workflow and potentially causing irreparable harm to institutional reputation if students perceive their progress tracking as unreliable. Furthermore, this vulnerability could be chained with other issues to escalate privileges or facilitate further attacks against the WordPress environment, such as defacement or malware injection by manipulating underlying database states indirectly through deleted records that trigger cascading errors or logic flaws in dependent modules.
This flaw aligns closely with Common Weakness Enumeration (CWE) category CWE-862, which describes Missing Authorization, and specifically relates to CWE-915 regarding Improper Control of Dynamically-Managed Code Resources when the deletion affects critical system state without proper checks. In terms of the MITRE ATT&CK framework for enterprise security, this vulnerability facilitates actions categorized under Tactic TA0004 Impact, particularly subtechniques like Data Destruction or Impair Defenses, as it allows an adversary to remove evidence of their presence by deleting logs and progress data while simultaneously disrupting normal operations. It also touches upon TA0005 Defense Evasion if the attacker uses this capability to cover tracks after gaining initial access through other means.
To mitigate this risk, immediate action is required from system administrators and developers maintaining Masteriyo installations. The primary remediation step involves upgrading the plugin to a version newer than 2.2.0 where the developer has presumably implemented proper role-based access control checks within the delete_item_permissions_check function. Until an update is applied or if no patch exists, temporary mitigations should include restricting direct file system and database access for web server users, implementing Web Application Firewalls (WAF) rules to block suspicious patterns targeting course progress endpoints, and enforcing strict input validation on all user-supplied data sent to the plugin’s API. Additionally, enabling comprehensive logging of administrative actions can help detect attempts to exploit this vulnerability post-deployment by monitoring for unusual spikes in deletion requests from unauthenticated sources. Regular security audits and code reviews focusing on permission checks are essential to prevent similar authorization bypasses in future updates or custom integrations within the WordPress ecosystem.