SPIP 3.0.x before 3.0.9, 2.1.x before 2.1.22, and 2.0.x before 2.0.23 allows remote attackers to gain privileges and "take editorial control" via vectors related to ecrire/inc/filtres.php.
Cross-site scripting (XSS) vulnerability in the author page (prive/formulaires/editerauteur.php) in SPIP before 2.1.24 and 3.0.x before 3.0.12 allows remote attackers to inject arbitrary web script or HTML via the urlsite parameter.
Cross-site request forgery (CSRF) vulnerability in ecrire/action/logout.php in SPIP before 2.1.24 allows remote attackers to hijack the authentication of arbitrary users for requests that logout the user via unspecified vectors.
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.