A PHP injection vulnerability in Spip before v3.2.8 allows attackers to execute arbitrary PHP code via the _oups parameter at /ecrire.
https://www.root-me.org/fr/Informations/Faiblesses-decouvertes/
https://thinkloveshare.com/en/hacking/rce_on_spip_and_root_me/
https://github.com/spip/SPIP/commit/6c1650713fc948318852ace759aab8f1a84791cf
https://github.com/spip/SPIP/commit/0394b44774555ae8331b6e65e35065dfa0bb41e4
https://blog.spip.net/Mise-a-jour-CRITIQUE-de-securite-SPIP-3-2-8-et-SPIP-3-1-13.html