ux-autocomplete is a JavaScript Autocomplete functionality for Symfony. Under certain circumstances, an attacker could successfully submit an entity id for an `EntityType` that is *not* part of the valid choices. The problem has been fixed in `symfony/ux-autocomplete` version 2.11.2.
https://symfony.com/bundles/ux-autocomplete/current/index.html#usage-in-a-form-with-ajax
https://github.com/symfony/ux-autocomplete/security/advisories/GHSA-4cpv-669c-r79x
https://github.com/symfony/ux-autocomplete/commit/fabcb2eee14b9e84a45b276711853a560b5d770c