CVE-2025-53209: Masteriyo LMS PRO Privilege Escalation

CVE-2025-53209 Overview

CVE-2025-53209 is an Incorrect Privilege Assignment vulnerability [CWE-266] in the Themeisle Masteriyo LMS PRO WordPress plugin. The flaw allows an unauthenticated attacker to escalate privileges on affected sites. All versions of Masteriyo LMS PRO up to and including 2.20.0 are affected.

The vulnerability is network-exploitable, requires no authentication, and needs no user interaction. Successful exploitation grants attackers elevated privileges with full impact on confidentiality, integrity, and availability of the target WordPress installation.

Critical Impact
Unauthenticated attackers can escalate privileges on vulnerable WordPress sites running Masteriyo LMS PRO 2.20.0 or earlier, leading to full site compromise.

Affected Products

Themeisle Masteriyo LMS PRO (WordPress plugin)
All versions from initial release through 2.20.0
WordPress sites with the learning-management-system-pro plugin installed and active

Discovery Timeline

2026-06-02 - CVE-2025-53209 published to NVD
2026-06-02 - Last updated in NVD database

Technical Details for CVE-2025-53209

Vulnerability Analysis

The vulnerability is classified as Incorrect Privilege Assignment [CWE-266]. The Masteriyo LMS PRO plugin assigns privileges to users or sessions in a manner that does not match the intended authorization model. As a result, an unauthenticated remote attacker can obtain elevated permissions on the WordPress site.

Learning Management System (LMS) plugins typically expose registration, enrollment, and role-assignment endpoints. When these endpoints fail to validate the requesting user's authority, attackers can manipulate parameters to assign themselves higher roles such as instructor or administrator. The Patchstack advisory confirms the impact is privilege escalation in the WordPress role model.

Root Cause

The root cause is improper role or capability assignment within the plugin's privileged actions. The plugin trusts client-supplied input or fails to verify the caller's existing capabilities before granting elevated roles. This deviates from the WordPress capability model, where role changes must be gated by current_user_can() checks and nonce verification.

Attack Vector

The attack vector is network-based over HTTP/HTTPS. An attacker sends a crafted request to a vulnerable Masteriyo LMS PRO endpoint without prior authentication. The plugin processes the request and assigns elevated privileges to an attacker-controlled account or session. The attacker then leverages the new role to upload plugins, modify content, exfiltrate data, or pivot to the underlying host.

No verified proof-of-concept code is published in the referenced advisory. Refer to the Patchstack Vulnerability Report for technical details.

Detection Methods for CVE-2025-53209

Indicators of Compromise

Unexpected WordPress user accounts with administrator, editor, or masteriyo_instructor roles created without administrator action.
Sudden role changes on existing accounts recorded in the wp_usermeta table for the wp_capabilities key.
New plugin or theme uploads, modified wp-config.php, or unfamiliar PHP files in wp-content/uploads/.
HTTP requests to Masteriyo REST routes under /wp-json/masteriyo/ or admin-ajax actions referencing the plugin from unauthenticated sources.

Detection Strategies

Audit the WordPress user table for accounts created or modified after the plugin was installed and compare against legitimate administrative activity.
Inspect web server access logs for POST requests targeting Masteriyo plugin endpoints originating from a single IP across multiple sessions.
Correlate WordPress audit logs with file integrity monitoring to detect privilege changes followed by file system writes.

Monitoring Recommendations

Enable a WordPress activity log plugin to record role assignments, user registrations, and capability changes in near real time.
Forward web server and PHP error logs to a centralized SIEM and alert on bursts of requests to /wp-json/masteriyo/* paths.
Monitor outbound connections from the web host for command-and-control or data-exfiltration behavior following suspicious role changes.

How to Mitigate CVE-2025-53209

Immediate Actions Required

Update Masteriyo LMS PRO to the version released after 2.20.0 that addresses CVE-2025-53209 as soon as the patched build is available from Themeisle.
Audit all WordPress accounts and immediately demote or remove any unauthorized administrator, editor, or instructor accounts.
Rotate passwords and invalidate active sessions for all privileged WordPress users on affected sites.
Review installed plugins, themes, and the wp-content/uploads/ directory for unauthorized files that may indicate post-exploitation activity.

Patch Information

The vendor advisory is published by Patchstack and indicates the issue affects Masteriyo LMS PRO from initial release through version 2.20.0. Administrators should consult the Patchstack Vulnerability Report and the Themeisle plugin changelog to confirm the fixed version and apply the update.

Workarounds

Deactivate and remove the Masteriyo LMS PRO plugin until a patched version is installed.
Restrict access to /wp-json/masteriyo/* and Masteriyo admin-ajax actions at the web application firewall layer for unauthenticated visitors.
Enforce two-factor authentication on all administrator accounts to limit the impact of a stolen or escalated session.

bash

# Example WAF rule (ModSecurity) blocking unauthenticated Masteriyo REST calls
SecRule REQUEST_URI "@beginsWith /wp-json/masteriyo/" \
    "id:1005321,phase:1,deny,status:403,\
     msg:'Block unauthenticated Masteriyo LMS PRO REST access (CVE-2025-53209)',\
     chain"
  SecRule &REQUEST_HEADERS:Cookie "@eq 0"