SPIP 2.x before 2.1.19, 3.0.x before 3.0.22, and 3.1.x before 3.1.1 allows remote attackers to execute arbitrary PHP code by adding content, related to the filtrerentites function.

The encodercontexteajax function in ecrire/inc/filtres.php in SPIP 2.x before 2.1.19, 3.0.x before 3.0.22, and 3.1.x before 3.1.1 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via a crafted serialized object.

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.

SPIP 3.1.x suffers from a Reflected Cross Site Scripting Vulnerability in /ecrire/exec/pucestatut.php involving the $id parameter, as demonstrated by a /ecrire/?exec=pucestatut URL.

SPIP 3.1.x suffer from a Reflected Cross Site Scripting Vulnerability in /ecrire/exec/infoplugin.php involving the $plugin parameter, as demonstrated by a /ecrire/?exec=infoplugin URL.