In Graylog before 2.4.6, XSS was possible in typeahead components, related to components/common/TypeAheadInput.jsx and components/search/QueryInput.ts.
https://github.com/advisories/GHSA-38hf-xjmx-jrh8
https://www.graylog.org/post/announcing-the-release-of-graylog-2-4-6