SPIP before 3.1.11 and 3.2 before 3.2.5 allows authenticated visitors to modify any published content and execute other modifications in the database. This is related to ecrire/inc/meta.php and ecrire/inc/securiser_action.php.
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/3cbc758400323ab006c00ea78eacdb8f76aa5f66
https://git.spip.net/SPIP/spip/commit/187952ce85e73b52c2753f2d54fc2c44807b8f79
https://blog.spip.net/Mise-a-jour-CRITIQUE-de-securite-Sortie-de-SPIP-3-2-5-et-SPIP-3-1-11.html