CVE-2026-2694: Events Calendar WordPress Auth Bypass Flaw

CVE-2026-2694 Overview

The Events Calendar plugin for WordPress contains a broken access control vulnerability that allows authenticated attackers to modify or delete data without proper authorization. The flaw exists in the can_edit and can_delete capability check functions within the plugin's REST API endpoints. All versions up to and including 6.15.16 are affected, enabling users with Contributor-level access or above to update or trash events, organizers, and venues they should not have permission to modify.

Critical Impact

Authenticated attackers with minimal privileges (Contributor-level) can modify or delete event data, organizers, and venues via the REST API, potentially disrupting organizational calendars and causing data loss.

Affected Products

• The Events Calendar WordPress Plugin versions up to and including 6.15.16
• WordPress installations running vulnerable versions of The Events Calendar
• Sites using The Events Calendar REST API endpoints

Discovery Timeline

• 2026-02-25 - CVE CVE-2026-2694 published to NVD
• 2026-02-25 - Last updated in NVD database

Technical Details for CVE-2026-2694

Vulnerability Analysis

This vulnerability is classified as CWE-285 (Improper Authorization). The flaw stems from inadequate capability checks within the plugin's REST API endpoints responsible for managing events, venues, and organizers. When processing edit or delete requests, the affected functions fail to properly verify whether the authenticated user has sufficient permissions to perform the requested operation on the specific resource.

The vulnerability is exploitable over the network and requires only low-privilege authenticated access. While it does not expose confidential data, it allows attackers to compromise the integrity of event data and cause availability impacts through unauthorized deletion of content.

Root Cause

The root cause is an improper capability check implementation in the can_edit and can_delete functions within the REST API endpoint classes. Specifically, the vulnerable code in Single_Event.php, Single_Venue.php, and related files does not adequately verify user permissions against the specific post being modified. This allows users with Contributor-level access to bypass intended access restrictions and manipulate content belonging to other users or requiring higher privilege levels.

Attack Vector

The attack is performed via the plugin's REST API endpoints. An attacker with a valid WordPress account at Contributor-level or above can craft malicious API requests to:

1. Update events created by other users or administrators
2. Trash (soft-delete) events, organizers, and venues they should not have access to
3. Modify venue and organizer information attached to events

The attack requires no user interaction and can be executed remotely over the network. The vulnerable endpoints are located in Single_Event.php (lines 498 and 563) and Single_Venue.php (lines 529 and 583) within the plugin's REST API implementation.

For detailed technical analysis of the vulnerable code paths, refer to the WordPress Events Calendar code references and the Wordfence Vulnerability Analysis.

Detection Methods for CVE-2026-2694

Indicators of Compromise

• Unexpected modifications to events, venues, or organizers in WordPress
• REST API requests to /wp-json/tribe/events/v1/ endpoints from low-privilege user accounts
• Audit logs showing Contributor-level users editing or deleting content they did not create
• Unusual patterns of event or venue deletions (trashed items)

Detection Strategies

• Enable WordPress audit logging to track all REST API interactions with The Events Calendar endpoints
• Monitor for authenticated API requests to Single_Event, Single_Venue, and Single_Organizer endpoints
• Configure web application firewall (WAF) rules to alert on unusual patterns of PUT/DELETE requests to calendar REST endpoints
• Review WordPress user activity logs for Contributor accounts performing administrative actions

Monitoring Recommendations

• Implement file integrity monitoring on The Events Calendar plugin directory
• Set up alerts for bulk modification or deletion of calendar-related post types
• Monitor REST API access patterns and flag anomalous activity from low-privilege accounts
• Enable detailed logging for all WordPress REST API authentication events

How to Mitigate CVE-2026-2694

Immediate Actions Required

• Update The Events Calendar plugin to a version newer than 6.15.16 immediately
• Audit existing Contributor-level and above user accounts for legitimacy
• Review recent changes to events, venues, and organizers for unauthorized modifications
• Temporarily restrict REST API access if immediate patching is not possible

Patch Information

The vendor has released a security patch addressing this vulnerability. The fix is available in the WordPress Events Calendar Changeset. Users should update to the latest version of The Events Calendar plugin through the WordPress plugin repository. The patch corrects the capability check logic in the can_edit and can_delete functions to properly verify user permissions before allowing modifications.

Workarounds

• Restrict REST API access using WordPress security plugins or server-level configurations until patching is possible
• Remove or demote unnecessary Contributor-level accounts to Subscriber level
• Implement additional authorization layers using security plugins that can enforce stricter capability checks
• Use .htaccess rules to restrict access to The Events Calendar REST API endpoints

# Apache .htaccess workaround to restrict REST API access to calendar endpoints
# Add to WordPress root .htaccess file
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-json/tribe/events/v1/ [NC]
RewriteCond %{REQUEST_METHOD} ^(PUT|DELETE|POST)$ [NC]
RewriteRule ^ - [F,L]
</IfModule>