SPIP 3.1.x before 3.1.6 and 3.2.x before Beta 3 does not remove shell metacharacters from the host field, allowing a remote attacker to cause remote code execution.
https://core.spip.net/projects/spip/repository/revisions/23594
https://core.spip.net/projects/spip/repository/revisions/23593
https://contrib.spip.net/CRITICAL-security-update-SPIP-3-1-6-and-SPIP-3-2-Beta