CVE-2025-32223: Tutor LMS Auth Bypass Vulnerability

CVE-2025-32223 Overview

An Authorization Bypass Through User-Controlled Key vulnerability has been identified in Themeum Tutor LMS, a popular WordPress learning management system plugin. This Insecure Direct Object Reference (IDOR) vulnerability allows authenticated attackers to exploit incorrectly configured access control security levels, potentially gaining unauthorized access to sensitive information by manipulating user-controlled parameters.

Critical Impact

Authenticated attackers can bypass authorization controls to access confidential data belonging to other users, potentially exposing course content, student information, and other protected resources within the LMS platform.

Affected Products

• Themeum Tutor LMS versions up to and including 3.9.4
• WordPress sites running vulnerable Tutor LMS plugin versions
• All deployments using affected versions without access control hardening

Discovery Timeline

• 2026-03-19 - CVE CVE-2025-32223 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2025-32223

Vulnerability Analysis

This vulnerability falls under CWE-639 (Authorization Bypass Through User-Controlled Key), commonly known as an Insecure Direct Object Reference (IDOR) vulnerability. The flaw exists in how Tutor LMS handles object references in user requests. When a user makes a request to access a specific resource, the application relies on a user-supplied identifier without properly verifying that the requesting user has authorization to access that particular object.

The vulnerability can be exploited over the network by any authenticated user with low-privilege access to the WordPress site. No user interaction is required for exploitation. While the vulnerability does not allow modification of data or denial of service, it permits unauthorized read access to confidential information, representing a significant breach of data confidentiality.

Root Cause

The root cause of this vulnerability is improper implementation of access control checks within Tutor LMS. The application accepts user-controlled keys (such as user IDs, course IDs, or enrollment IDs) in requests and retrieves the corresponding data without adequately verifying that the authenticated user has the appropriate permissions to access those specific resources. This represents a fundamental failure in implementing the principle of least privilege and proper authorization checks at the object level.

Attack Vector

The attack vector for this vulnerability is network-based, requiring authenticated access to the WordPress installation running Tutor LMS. An attacker would first authenticate as a legitimate low-privilege user, then manipulate object reference parameters in API requests or form submissions to access resources belonging to other users.

The exploitation process involves intercepting legitimate requests to the LMS, identifying parameters that reference specific objects (such as student enrollments, quiz attempts, or course data), and systematically modifying these values to enumerate and access data belonging to other users. The lack of proper server-side authorization checks allows these manipulated requests to succeed.

For detailed technical information about the vulnerability mechanism and exploitation scenarios, see the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-32223

Indicators of Compromise

• Unusual access patterns showing a single user accessing multiple user records in rapid succession
• API or form requests with sequential or enumerated object identifiers from a single session
• Access logs showing authenticated users retrieving data for resources they should not have permission to view
• Anomalous query patterns in database logs indicating unauthorized data retrieval

Detection Strategies

• Implement web application firewall (WAF) rules to detect parameter tampering and IDOR attack patterns
• Enable detailed access logging for Tutor LMS API endpoints and monitor for suspicious access patterns
• Deploy runtime application self-protection (RASP) solutions to detect unauthorized object access attempts
• Utilize SentinelOne Singularity Platform for endpoint detection of post-exploitation activities

Monitoring Recommendations

• Monitor WordPress access logs for unusual patterns of sequential ID access from single user sessions
• Set up alerts for high-volume data access requests from low-privilege user accounts
• Review audit logs for discrepancies between user permissions and accessed resources
• Implement anomaly detection for API request patterns that deviate from normal user behavior

How to Mitigate CVE-2025-32223

Immediate Actions Required

• Update Themeum Tutor LMS to a version newer than 3.9.4 that addresses this vulnerability
• Conduct an access log review to identify potential past exploitation attempts
• Implement additional authorization checks at the application or WAF level as a defense-in-depth measure
• Review and restrict user permissions to minimize the impact of potential exploitation

Patch Information

Themeum has addressed this vulnerability in versions after 3.9.4. Administrators should update to the latest available version of Tutor LMS immediately. The update can be applied through the WordPress plugin update mechanism or by downloading the patched version from the official WordPress plugin repository.

For additional details regarding the patch and vulnerability specifics, consult the Patchstack Vulnerability Report.

Workarounds

• Implement a Web Application Firewall (WAF) with rules to detect and block parameter manipulation attacks
• Restrict access to Tutor LMS administrative and data-sensitive endpoints by IP address where possible
• Enable WordPress two-factor authentication to reduce the risk of unauthorized account access
• Consider temporarily disabling external user registration until the patch is applied

# Configuration example - WordPress WAF rule (ModSecurity format)
# Block suspicious sequential parameter access patterns
SecRule ARGS "@rx ^[0-9]+$" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    msg:'Potential IDOR attack detected',\
    chain"
SecRule REQUEST_URI "@contains /tutor/" \
    "t:lowercase"