CVE-2026-77010: HEL Online Classroom Auth Bypass Flaw

CVE-2026-77010 Overview

CVE-2026-77010 is a broken access control vulnerability in the HEL Online Classroom: AI-powered Online Classrooms WordPress plugin through version 1.0.3. The plugin fails to perform authorization checks on its REST API routes and does not consistently enforce the per-class access code. Unauthenticated attackers can obtain a signed meeting join link for any classroom, including classrooms protected by an access code, and join those sessions with moderator privileges. The flaw is categorized under CWE-284: Improper Access Control.

Critical Impact
Unauthenticated attackers can join any protected classroom with moderator privileges by requesting signed join links from unprotected REST API routes.

Affected Products

HEL Online Classroom: AI-powered Online Classrooms WordPress plugin, versions up to and including 1.0.3
WordPress sites running the vulnerable plugin with REST API exposed to the internet
Classrooms protected by per-class access codes on affected plugin versions

Discovery Timeline

2026-08-29 - CVE-2026-77010 published to NVD
2026-08-31 - Last updated in NVD database

Technical Details for CVE-2026-77010

Vulnerability Analysis

The HEL Online Classroom plugin exposes REST API routes that manage classroom access and meeting join links. These routes do not implement a permission_callback that validates the caller's identity or role. As a result, any unauthenticated HTTP client can invoke the endpoints that mint signed join links.

The plugin also fails to consistently validate the per-class access code before issuing a signed link. Attackers bypass the access-code gate by targeting the routes that skip this check. The signed link returned by the server is accepted by the meeting layer as proof of authorization and grants moderator-level privileges to the joining user.

Root Cause

The root cause is missing authorization enforcement on REST API endpoints registered by the plugin. The endpoints rely on client-supplied parameters rather than server-side session or capability checks. The access-code verification path is applied inconsistently across handlers, leaving alternative routes that produce the same signed artifact without validation.

Attack Vector

Exploitation requires only network access to the WordPress REST API of a site running the vulnerable plugin. An attacker enumerates classroom identifiers, then issues a crafted request to the unprotected REST route to obtain a signed join link. The attacker follows the link and enters the meeting session with moderator rights, gaining the ability to observe participants, modify session state, or disrupt the class. Refer to the WPScan Vulnerability Report for the technical write-up.

Detection Methods for CVE-2026-77010

Indicators of Compromise

Unauthenticated HTTP requests to plugin REST routes under /wp-json/ that reference classroom or meeting join endpoints
Meeting join events for classrooms in which no matching access-code submission was logged
Moderator-privileged joins originating from IP addresses not previously associated with instructor accounts

Detection Strategies

Review WordPress and web server access logs for anomalous request volumes against plugin REST routes, especially requests that return signed join tokens
Correlate meeting session logs with access-code validation events to identify sessions joined without a preceding code check
Alert on any REST request to plugin endpoints that returns a signed URL or JWT-style token to an unauthenticated client

Monitoring Recommendations

Enable REST API request logging on the WordPress host and forward logs to a centralized analytics platform
Monitor for enumeration patterns targeting sequential classroom identifiers
Track moderator role assignments in live sessions and alert when they exceed expected instructor counts

How to Mitigate CVE-2026-77010

Immediate Actions Required

Deactivate the HEL Online Classroom plugin until a vendor-supplied patch is installed on all affected WordPress sites
Restrict access to the WordPress REST API using a web application firewall rule that blocks unauthenticated requests to the plugin's routes
Rotate any active classroom access codes and terminate ongoing meeting sessions initiated during the exposure window

Patch Information

No vendor advisory or fixed version was listed in the NVD record at publication. Site operators should consult the WPScan Vulnerability Report and the plugin's changelog for updated releases beyond 1.0.3.

Workarounds

Disable the plugin on production WordPress sites until an updated version is available
Block external access to /wp-json/ routes exposed by the plugin using WAF rules or .htaccess restrictions
Require an authenticated WordPress session at the reverse proxy layer for any request path used by the plugin's REST handlers

bash

# Example Nginx rule to block unauthenticated access to plugin REST routes
location ~ ^/wp-json/hel-online-classroom/ {
    if ($http_cookie !~* "wordpress_logged_in") {
        return 403;
    }
}