CVE-2026-24670: Open eClass Auth Bypass Vulnerability

CVE-2026-24670 Overview

CVE-2026-24670 is a broken access control vulnerability in the Open eClass platform (formerly known as GUnet eClass), a complete course management system used by educational institutions. Prior to version 4.2, a broken access control flaw allows authenticated students to create new course units, an action normally restricted to higher-privileged roles such as instructors or administrators.

Critical Impact

Authenticated users with low privileges (students) can bypass authorization controls to perform administrative actions, potentially disrupting course content integrity and undermining the trust model of the learning management system.

Affected Products

• Open eClass (GUnet eClass) versions prior to 4.2

Discovery Timeline

• 2026-02-03 - CVE CVE-2026-24670 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2026-24670

Vulnerability Analysis

This vulnerability falls under CWE-284 (Improper Access Control), where the application fails to properly enforce authorization checks when processing requests to create course units. In a properly secured course management system, the ability to create, modify, or delete course units should be restricted to users with elevated privileges such as instructors, course administrators, or system administrators. However, the vulnerable versions of Open eClass do not adequately verify that the requesting user possesses the necessary permissions before executing the course unit creation functionality.

The vulnerability is exploitable over the network and requires only low-level privileges (an authenticated student account). No user interaction is required for exploitation, making it straightforward for an attacker to abuse once they have valid credentials. While this vulnerability does not lead to confidentiality breaches or system availability issues, it poses a high integrity risk as unauthorized users can manipulate course content.

Root Cause

The root cause of this vulnerability is improper access control implementation in the course unit creation functionality. The application fails to verify that the authenticated user has the appropriate role or permissions before allowing the creation of new course units. This represents a failure to implement the principle of least privilege, where users should only be granted access to resources and actions necessary for their role.

Attack Vector

The attack vector is network-based and requires the attacker to have a valid student account on the Open eClass platform. Once authenticated, the attacker can craft requests to the course unit creation endpoint, bypassing the intended role-based access controls. This allows students to create course units that would normally require instructor or administrator privileges.

The exploitation path involves:

1. Authenticating to the Open eClass platform with a student account
2. Identifying the API endpoint or form submission path for creating course units
3. Submitting a request to create a new course unit, which the application improperly processes without verifying sufficient privileges

For detailed technical information about this vulnerability, refer to the GitHub Security Advisory.

Detection Methods for CVE-2026-24670

Indicators of Compromise

• Unexpected course units appearing in courses without corresponding instructor actions
• Audit logs showing course unit creation events from student accounts
• Anomalous patterns of course modification activity from low-privileged users
• Student accounts performing administrative-level API calls or form submissions

Detection Strategies

• Monitor application logs for course unit creation events and correlate with user role information
• Implement alerting on any course modification actions performed by users with student-level privileges
• Review access control logs for authorization bypass attempts or unexpected privilege usage
• Deploy web application firewalls (WAF) with rules to detect suspicious parameter manipulation

Monitoring Recommendations

• Enable verbose logging for all course management operations including user role at time of action
• Implement real-time alerting for administrative actions performed by non-administrative users
• Regularly audit course content changes against expected instructor activity patterns
• Consider implementing session monitoring to detect privilege abuse in real-time

How to Mitigate CVE-2026-24670

Immediate Actions Required

• Upgrade Open eClass to version 4.2 or later immediately
• Audit existing course units to identify any unauthorized content created by students
• Review user roles and permissions to ensure proper access control configuration
• Temporarily restrict course unit creation capabilities while patching if immediate upgrade is not possible

Patch Information

The Open eClass development team has addressed this vulnerability in version 4.2. Organizations running affected versions should upgrade to the patched version as soon as possible. For more information about the security fix, consult the GitHub Security Advisory.

Workarounds

• Implement additional access control checks at the web server or reverse proxy level to restrict access to course unit creation endpoints
• Use network segmentation to limit access to the Open eClass admin functionality from untrusted networks
• Consider implementing application-layer firewall rules to block unauthorized role-based requests
• Monitor and audit all course modifications pending the upgrade to the patched version

# Verify current Open eClass version
cat /path/to/openeclass/version.php

# After upgrading, verify the new version
grep -i "version" /path/to/openeclass/version.php
# Expected output should show version 4.2 or higher