CVE-2026-2997: Tronclass IDOR Auth Bypass Vulnerability

CVE-2026-2997 Overview

CVE-2026-2997 is an Insecure Direct Object Reference (IDOR) vulnerability affecting Tronclass, a learning management system developed by WisdomGarden. This vulnerability allows authenticated remote attackers to bypass authorization controls and obtain course invitation codes by manipulating specific request parameters after acquiring a valid course ID. Successful exploitation enables unauthorized users to join any course within the platform without proper enrollment authorization.

Critical Impact
Authenticated attackers can bypass course enrollment restrictions, potentially gaining unauthorized access to educational content, student data, and course materials across the entire Tronclass platform.

Affected Products

Tronclass by WisdomGarden (specific versions not disclosed)

Discovery Timeline

2026-02-23 - CVE-2026-2997 published to NVD
2026-02-23 - Last updated in NVD database

Technical Details for CVE-2026-2997

Vulnerability Analysis

This vulnerability is classified under CWE-639 (Authorization Bypass Through User-Controlled Key), which describes situations where an application uses user-controlled input to access database objects without proper authorization verification. In the context of Tronclass, the application fails to verify whether the authenticated user has appropriate permissions to retrieve course invitation codes before returning them in API responses.

The vulnerability exploits a common web application weakness where server-side authorization checks are insufficient or missing entirely. When a user requests information about a course, the application retrieves and returns the course invitation code based solely on the provided course ID parameter, without validating whether the requesting user should have access to that specific course's enrollment credentials.

Root Cause

The root cause of this vulnerability lies in improper access control implementation within the Tronclass application. The system does not adequately verify that the authenticated user has the necessary permissions (such as being an instructor or administrator) before exposing sensitive course enrollment data. This represents a failure to implement proper authorization checks at the object level, allowing any authenticated user to access resources belonging to other courses.

Attack Vector

The attack is conducted over the network by authenticated users. An attacker would first need valid credentials to access the Tronclass platform, then obtain or enumerate valid course IDs. By modifying the course ID parameter in API requests, the attacker can retrieve invitation codes for courses they are not authorized to access. This attack requires no user interaction and has low complexity since it only involves parameter manipulation in standard HTTP requests.

The exploitation flow involves:

Authenticating to the Tronclass platform with valid credentials
Identifying or enumerating valid course IDs through the application
Crafting requests with modified course ID parameters to target specific courses
Receiving course invitation codes in the server response
Using the obtained invitation codes to join unauthorized courses

For technical details regarding the specific parameters and endpoints affected, refer to the TW-CERT Security Advisory.

Detection Methods for CVE-2026-2997

Indicators of Compromise

Unusual patterns of course invitation code requests from a single authenticated user
Multiple failed or successful course enrollment attempts using invitation codes obtained in rapid succession
API requests accessing course details or invitation codes for courses the user is not enrolled in
Anomalous access patterns showing a user querying multiple unrelated course IDs

Detection Strategies

Implement logging and monitoring for all course invitation code retrieval requests
Configure alerts for users attempting to access course information for courses they are not enrolled in or instructing
Monitor for sequential or bulk course ID enumeration patterns in API logs
Deploy web application firewalls with rules to detect parameter manipulation attempts

Monitoring Recommendations

Enable detailed audit logging for all course-related API endpoints
Implement anomaly detection for unusual course access patterns
Monitor authentication logs for accounts exhibiting suspicious course browsing behavior
Create dashboards to track invitation code generation and usage metrics

How to Mitigate CVE-2026-2997

Immediate Actions Required

Review and audit all Tronclass API endpoints that expose course-related information
Implement server-side authorization checks to verify user permissions before returning course invitation codes
Consider temporarily restricting course invitation code functionality until patches are applied
Monitor access logs for signs of exploitation attempts

Patch Information

Organizations using Tronclass should contact WisdomGarden for the latest security patches and updates. For official advisory information, refer to the TW-CERT Security Advisory and the TW-CERT Incident Report for vendor remediation guidance.

Workarounds

Implement additional authorization layers at the network or application level to restrict access to course management APIs
Disable or restrict the course invitation code feature until proper authorization controls are in place
Configure web application firewalls to block suspicious parameter manipulation patterns
Limit course ID visibility and implement rate limiting on course-related API endpoints
Conduct regular access control audits to identify and remediate similar IDOR vulnerabilities