In the portal in LemonLDAP::NG before 2.21.0, cross-site scripting (XSS) allows remote attackers to inject arbitrary web script or HTML (into the login page) via the tab parameter, for Choice authentication.
https://lists.debian.org/debian-lts-announce/2025/04/msg00017.html
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/issues/3341