Codoforum 4.8.3 allows XSS in the admin dashboard via a category to the Manage Users screen.

Codoforum 4.8.3 allows XSS in the user registration page: via the username field to the index.php?u=/user/register URI. The payload is, for example, executed on the admin/index.php?page=users/manage page.

Codoforum 4.8.3 allows XSS via a post using parameters display name, title name, or content.

Codoforum 4.8.3 allows XSS in the admin dashboard via a name field of a new user, i.e., on the Manage Users screen.