The Photo Gallery by Ays plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 6.4.8. This is due to missing nonce verification on the bulk action functionality in the 'processbulkaction()' function. This makes it possible for unauthenticated attackers to perform bulk operations (delete, publish, or unpublish galleries) via a forged request granted they can trick an administrator into performing an action such as clicking on a link.