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.
http://www.openwall.com/lists/oss-security/2013/05/27/2
http://www.debian.org/security/2013/dsa-2694
http://core.spip.org/projects/spip/repository/revisions/20541
http://contrib.spip.net/SPIP-3-0-9-2-1-22-2-0-23-corrections-de-bug-et-faille?lang=fr