SPIP is vulnerable to Remote Code Execution (RCE). The vulnerability exists because of the improper sanitization of form values in the public area, allowing an attacker to inject and execute malicious code.
packetstormsecurity.com/files/171921/SPIP-Remote-Command-Execution.html
packetstormsecurity.com/files/173044/SPIP-4.2.1-Remote-Code-Execution.html
blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-2-1-SPIP-4-1-8-SPIP-4-0-10-et.html
git.spip.net/spip/spip/commit/5aedf49b89415a4df3eb775eee3801a2b4b88266
git.spip.net/spip/spip/commit/96fbeb38711c6706e62457f2b732a652a04a409d
security-tracker.debian.org/tracker/CVE-2023-27372
www.debian.org/security/2023/dsa-5367