The Eventin WordPress plugin before 4.1.16 does not properly authorize order creation and accepts an attacker-supplied order status, allowing unauthenticated users to create orders marked as paid without completing any payment.

The Eventin WordPress plugin before 4.1.20 does not properly restrict access to stored customer records, allowing users with contributor-level access and above to read other customers' personal data such as names and email addresses.

The Eventin WordPress plugin before 4.1.19 does not properly restrict which changes a guest checkout token is allowed to authorise on an order, allowing unauthenticated users to mark their own unpaid order as completed and be issued a valid paid ticket with no payment taken.

The Eventin WordPress plugin before 4.1.21 does not verify the current user's permission to edit other users before assigning roles and updating user metadata during speaker creation, allowing users with contributor-level access and above to modify other users' roles and metadata.

The Eventin WordPress plugin before 4.1.21 does not validate a user-supplied webhook URL stored on events nor verify event ownership, allowing users with contributor-level access and above to trigger blind server-side requests to arbitrary hosts.