CVE-2026-77008 Overview
CVE-2026-77008 affects the HEL Online Classroom: AI-powered Online Classrooms WordPress plugin through version 1.0.3. The plugin fails to perform authorization or authentication checks when saving its settings. Unauthenticated attackers can overwrite plugin configuration remotely. This allows redirection of every online classroom, along with the shared secret used to sign sessions, to attacker-controlled infrastructure. The weakness is categorized as improper access control [CWE-284].
Critical Impact
Unauthenticated attackers can repoint classroom sessions and steal signed session material by overwriting plugin settings over the network.
Affected Products
- HEL Online Classroom: AI-powered Online Classrooms WordPress plugin
- All versions through 1.0.3
- WordPress sites running the vulnerable plugin
Discovery Timeline
- 2026-08-29 - CVE-2026-77008 published to NVD
- 2026-08-31 - Last updated in NVD database
Technical Details for CVE-2026-77008
Vulnerability Analysis
The HEL Online Classroom plugin exposes a settings-save endpoint that does not verify the requester's identity or capabilities. WordPress plugins are expected to gate administrative actions with current_user_can() checks and nonce validation via check_admin_referer() or wp_verify_nonce(). The plugin omits both controls on the settings handler.
An unauthenticated attacker can submit a crafted HTTP request that rewrites the classroom endpoint URL and the shared secret used to sign session tokens. Every subsequent classroom session on the affected site is issued against attacker-controlled infrastructure using an attacker-known signing key.
Root Cause
The root cause is missing authorization on a state-changing action, mapped to [CWE-284] Improper Access Control. The settings persistence routine trusts request parameters without validating the caller. No capability check, nonce check, or authentication gate protects the write path.
Attack Vector
Exploitation requires only network access to the WordPress site. The attacker sends an HTTP POST request to the plugin's settings handler with the desired classroom URL and shared secret values. No user interaction and no credentials are required. See the WPScan Vulnerability Report for technical details on the affected handler.
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Stop Identity AttacksDetection Methods for CVE-2026-77008
Indicators of Compromise
- Unexpected changes to HEL Online Classroom plugin settings, particularly the classroom endpoint URL and shared secret fields.
- Outbound classroom session traffic directed at unfamiliar hostnames or IP addresses.
- WordPress options table entries for the plugin modified without a corresponding administrator login in access logs.
Detection Strategies
- Monitor WordPress access logs for unauthenticated POST requests targeting the plugin's admin-ajax or admin-post settings handlers.
- Compare current plugin settings against a known-good baseline using WP-CLI (wp option get) on a scheduled basis.
- Alert on modifications to plugin option rows when no authenticated administrator session preceded the change.
Monitoring Recommendations
- Enable WordPress audit logging to capture option changes with source IP attribution.
- Track DNS resolution and egress connections initiated by classroom session flows for deviation from expected destinations.
- Review web server logs for high-volume anonymous POST requests to plugin endpoints.
How to Mitigate CVE-2026-77008
Immediate Actions Required
- Deactivate the HEL Online Classroom plugin until a fixed release is available.
- Rotate the shared secret and any session tokens issued while the plugin was exposed.
- Audit plugin settings and restore the legitimate classroom endpoint URL.
- Invalidate active classroom sessions and require users to re-authenticate.
Patch Information
At the time of publication, no fixed version beyond 1.0.3 is referenced in the NVD entry. Consult the WPScan Vulnerability Report and the plugin vendor for updated release information before reactivating the plugin.
Workarounds
- Block unauthenticated requests to the plugin's settings endpoints at the web application firewall.
- Restrict access to /wp-admin/admin-ajax.php and /wp-admin/admin-post.php handlers used by the plugin to authenticated administrator source IPs.
- Remove the plugin directory from the WordPress installation if the classroom functionality is not in active use.
# Configuration example: WP-CLI plugin deactivation
wp plugin deactivate hel-online-classroom
wp option get hel_online_classroom_settings
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
