GNUBOARD5 before 5.3.2.0 has XSS that allows remote attackers to inject arbitrary web script or HTML via the "homepage title" parameter, aka the adm/config_form_update.php cf_title parameter.
https://github.com/gnuboard/gnuboard5/releases/tag/5.3.2.0
https://github.com/gnuboard/gnuboard5/compare/15b2e73...2549172