SPIP before 3.1.11 and 3.2 before 3.2.5 mishandles redirect URLs in ecrire/inc/headers.php with a %0D, %0A, or %20 character.
https://www.debian.org/security/2019/dsa-4532
https://usn.ubuntu.com/4536-1/
https://seclists.org/bugtraq/2019/Sep/40
https://lists.debian.org/debian-lts-announce/2019/10/msg00038.html
https://git.spip.net/SPIP/spip/commit/0b832408b0aabd5b94a81e261e9413c0f31a19f1
https://core.spip.net/issues/4362
https://blog.spip.net/Mise-a-jour-CRITIQUE-de-securite-Sortie-de-SPIP-3-2-5-et-SPIP-3-1-11.html