The Security Screen (_core_/securite/ecran_securite.php) before 1.1.8 for SPIP, as used in SPIP 3.0.x before 3.0.12, allows remote attackers to execute arbitrary PHP via the connect parameter.
https://www.debian.org/security/2013/dsa-2794
http://www.spip.net/fr_article5648.html
http://www.spip.net/fr_article5646.html
http://www.securitytracker.com/id/1029317