applications/core/modules/front/system/content.php in Invision Power Services IPS Community Suite (aka Invision Power Board, IPB, or Power Board) before 4.1.13, when used with PHP before 5.4.24 or 5.5.x before 5.5.8, allows remote attackers to execute arbitrary code via the content_class parameter.
Invision Power Services IPS Community Suite (aka Invision Power Board, IPB, or Power Board) before 4.0.12.1 allows remote attackers to cause a denial of service (loop and memory consumption) via a crafted URL.