The Kirki WordPress plugin before 6.3.0 does not check whether the requester is allowed to read a post before rendering and returning its page content, allowing unauthenticated users to retrieve the content of pages that are not publicly available, such as private, draft, pending and trashed ones.

The Kirki WordPress plugin before 6.3.0 does not hold back every spelling of the HTML entities it decodes when rendering, allowing unauthenticated users to store JavaScript in a comment which then runs in the session of anyone viewing a page that displays it, including an administrator, and on every page of the site when its header or footer is built to show comments.

The Kirki WordPress plugin before 6.0.14 does not perform a capability check on some endpoints of one of its public AJAX actions, allowing unauthenticated users to retrieve the email addresses of registered users and comment authors, as well as non-public page content and settings.

The Kirki WordPress plugin before 6.2.1 does not properly authorise its front-end form submission REST routes and passes attacker-controlled input through shortcode execution, allowing unauthenticated users to run any shortcode registered on the site, which on a default install leads to disclosure of the site administrator's email address and an arbitrary-recipient mail relay from the victim's domain.