Vulnerability in Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce — CVE-2026-12956
What to do now
Update Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce to 4.1.23 or later.
Affected versions
- Everything up to and including 4.1.22
Affected: Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce (plugin, wp-event-solution)
What the vulnerability is
The WP Event Solution (Eventin) plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 4.1.22 via the create_item() handler for the /wp-json/eventin/v2/orders REST endpoint. The endpoint's create_item_permissions_check() function only verifies a wp_rest nonce (which is leaked to every visitor through the etn-public script's localized_data_obj on every frontend page) and accepts a user-supplied 'status' value in prepare_item_for_database() with no whitelist validation. This makes it possible for unauthenticated attackers to create etn-order posts with status='completed' that are counted as sold by etn_get_sold_tickets_by_event(); because the auto-cleanup wp_schedule_single_event() in create_item() only fires for status='pending' orders, the forged completed orders persist indefinitely and exhaust ticket inventory.