ecrire/public/assembler.php in SPIP before 4.1.13 and 4.2.x before 4.2.7 allows XSS because input from _request() is not restricted to safe characters such as alphanumerics.
https://lists.debian.org/debian-lts-announce/2024/03/msg00014.html
https://git.spip.net/spip/spip/commit/e90f5344b8c82711053053e778d38a35e42b7bcb