CVE-2026-9228: MotoPress Timetable IDOR Vulnerability

CVE-2026-9228 Overview

CVE-2026-9228 is an Insecure Direct Object Reference (IDOR) vulnerability [CWE-639] in the Timetable and Event Schedule by MotoPress plugin for WordPress. The flaw affects all versions up to and including 2.4.16. The vulnerability resides in the action_get_event_data handler, which fails to validate a user-controlled key before retrieving event records. Authenticated attackers with contributor-level access or higher can enumerate timeslot IDs and read non-public mp-event posts belonging to other users. Exposed data includes post_content, post_excerpt, post_status, post_author, and raw timeslot descriptions for draft, pending, and private events.

Critical Impact

Authenticated low-privilege users can read draft, pending, and private event posts owned by other authors, exposing unpublished content and editorial workflow data.

Affected Products

• Timetable and Event Schedule by MotoPress plugin for WordPress
• All plugin versions up to and including 2.4.16
• WordPress sites granting contributor-level or higher accounts to untrusted users

Discovery Timeline

• 2026-05-28 - CVE CVE-2026-9228 published to NVD
• 2026-05-28 - Last updated in NVD database

Technical Details for CVE-2026-9228

Vulnerability Analysis

The vulnerability stems from a missing authorization check in the plugin's AJAX handler that returns event data. The action_get_event_data function accepts a client-supplied identifier and returns the corresponding WP_Post object without verifying that the requesting user has permission to view the target post. WordPress contributor accounts are normally limited to drafting their own content and viewing public posts. This flaw breaks that boundary by serving private, draft, and pending mp-event posts authored by other users. Returned fields include the full post_content, post_excerpt, post_status, post_author, and the associated raw timeslot descriptions.

Root Cause

The handler performs object lookup based on a user-controlled key without an accompanying capability check such as current_user_can('read_post', $post_id). The plugin treats authentication as sufficient authorization, conflating the two controls. Because timeslot IDs are sequential integers, an attacker can enumerate values and harvest data across the entire site. This pattern is the canonical [CWE-639] weakness — authorization through obscurity of identifiers rather than enforced access policy.

Attack Vector

Exploitation requires an authenticated session at the contributor role or above. The attacker issues repeated requests to the plugin's AJAX endpoint, varying the timeslot identifier on each call. For each valid ID, the server returns the associated event post regardless of ownership or post_status. No user interaction by the victim is required, and the attack is conducted entirely over the network. The impact is scoped to confidentiality — no modification or denial of service is enabled.

No public proof-of-concept code is referenced in the advisory. Technical details are available in the WordPress MP Timetable Events Controller and the Wordfence Vulnerability ID 9adf94ac advisory.

Detection Methods for CVE-2026-9228

Indicators of Compromise

• Repeated authenticated POST requests to admin-ajax.php with the action=get_event_data parameter from a single contributor or author account.
• Sequential or incrementing values in the timeslot ID parameter, indicating enumeration behavior.
• Unusual volumes of AJAX traffic originating from low-privilege accounts that do not normally interact with event scheduling.

Detection Strategies

• Review web server access logs for bursts of requests to the plugin's AJAX action from non-administrator sessions.
• Correlate WordPress user activity logs with HTTP request patterns to identify contributors accessing data outside their authored content.
• Inspect application logs for WP_Post responses containing post_status values of draft, pending, or private returned to non-owner users.

Monitoring Recommendations

• Enable verbose logging on the WordPress AJAX endpoint and forward to a centralized log platform for retention and search.
• Alert on any single account requesting more than a defined threshold of action_get_event_data calls within a short window.
• Audit contributor and author accounts for anomalous login times, IP changes, or elevated API activity following privilege grants.

How to Mitigate CVE-2026-9228

Immediate Actions Required

• Update the Timetable and Event Schedule by MotoPress plugin to the version that supersedes 2.4.16 as referenced in the WordPress MP Timetable Changeset.
• Audit existing contributor, author, and editor accounts and disable any that are unused or untrusted.
• Rotate credentials for accounts that show suspicious AJAX activity targeting the action_get_event_data endpoint.

Patch Information

The vendor addressed the issue in a plugin update published after 2.4.16. The fix introduces validation on the user-controlled key so that action_get_event_data checks the requester's capability against the target post before returning data. Site administrators should apply the update through the WordPress plugin manager and verify the installed version reflects the patched release. See the WordPress MP Timetable Core Class and WordPress MP Timetable Events Model references for the affected code paths.

Workarounds

• Restrict contributor-level and above registration on sites where untrusted users may sign up.
• Place a web application firewall rule in front of admin-ajax.php that rate-limits or blocks requests with action=get_event_data from non-administrator sessions until the patch is applied.
• Temporarily deactivate the MotoPress Timetable plugin if patching cannot be performed and no production content depends on it.