SPIP 3.1.x suffers from a Reflected Cross Site Scripting Vulnerability in /ecrire/exec/puce_statut.php involving the `$id` parameter, as demonstrated by a /ecrire/?exec=puce_statut URL.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-10780
https://core.spip.net/projects/spip/repository/revisions/23288