The Eventer plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the 'eventer_export_bookings_csv' function in all versions up to, and including, 3.9.9. This makes it possible for authenticated attackers with subscriber-level permissions or above, to download bookings, which contains customers' personal data.

The Eventer plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the 'handle_pdf_download_request' function in all versions up to, and including, 3.9.9. This makes it possible for unauthenticated attackers to download event tickets.

The Eventer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via shortcodes in versions up to, and including, 3.9.9 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Eventer plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 3.9.7 via the eventer_woo_download_tickets() function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information.