CVE-2026-49111: Masteriyo LMS Privilege Escalation Vulnerability

Technical summary

CVE-2026-49111 is an Incorrect Privilege Assignment vulnerability (CWE-266) in Masteriyo LMS that enables privilege escalation. The flaw stems from improper handling of user roles during assignment or validation, allowing an authenticated user with low privileges to escalate to higher-privileged roles or access restricted functionality. The CVSS 3.1 score of 8.8 (HIGH) reflects the network-accessible nature, low attack complexity, and high impact across confidentiality, integrity, and availability when exploited.

Business impact

Successful exploitation could allow course instructors, students, or other low-privileged users to assume admin or instructor roles without authorization. This creates risks of unauthorized course modifications, student data theft, credential exposure, content destruction, and disruption of learning operations. Organizations relying on Masteriyo for compliance training or sensitive content delivery face regulatory and reputational risk if privilege boundaries are compromised.

Affected systems

Masteriyo - LMS versions up to and including 2.2.0 are affected. Organizations using Masteriyo on WordPress installations should verify their current version immediately. No information suggests newer versions exist in the ground truth data, so assume all deployed instances may require remediation.

Exploitability

This vulnerability requires an attacker to be authenticated to the system (PR:L), but requires no user interaction and can be exploited over the network. Once an account—even a low-privilege one like a student—is obtained, the privilege escalation can be automated. The straightforward nature of privilege assignment logic makes this relatively reliable to exploit in practice, though complexity remains low (AC:L).

Remediation

Update Masteriyo LMS to a patched version beyond 2.2.0 as soon as it becomes available from ThemeGrill. Until a patch is released, restrict LMS access to trusted users, disable self-registration if possible, enforce strong authentication, and monitor user role assignments and privilege escalations in audit logs. Consider temporarily limiting lower-privileged user account creation.

Patch guidance

Check ThemeGrill's official security advisory and plugin update channels for a release addressing CVE-2026-49111. Apply updates to all Masteriyo LMS installations as part of your WordPress update cycle. Test patches in a staging environment before production deployment to ensure compatibility with existing courses and user data. Verify the installed version post-update by navigating to Plugins > Installed Plugins and confirming the version number exceeds 2.2.0.

Detection guidance

Monitor Masteriyo database tables and audit logs for unexpected role or capability changes, especially transitions of users to admin or instructor status. Check WordPress user metadata and postmeta tables for suspicious privilege assignments. Enable detailed WordPress and Masteriyo logging if available. Look for logins from low-privilege accounts followed immediately by actions requiring elevated permissions. Query WordPress user roles regularly and compare against expected organizational assignments.

Why prioritize this

With a CVSS score of 8.8 and HIGH severity, this should be treated as urgent. The vulnerability allows authenticated users to escalate privileges with no user interaction required, directly impacting the confidentiality and integrity of LMS data and operations. Any organization running Masteriyo should patch immediately upon vendor availability, and interim controls should be deployed now to limit exposure.

Risk score, explained

The 8.8 CVSS score reflects a network-accessible flaw (AV:N) with low attack complexity (AC:L) that requires only valid user authentication (PR:L) but no social engineering. The impact is severe across all three security pillars: unauthorized data access (C:H), modification of courses and records (I:H), and potential system disruption (A:H). The lack of a widespread, reliable exploit in the wild and KEV status does not reduce the inherent risk to organizations running vulnerable versions.

Frequently asked questions