Both XOOPS and ImpressCMS have released updates to address the recently disclosed security flaw. The National Vulnerability Database and SecurityFocus both reported details of a security flaw that affected both CMS platforms.
XOOPS has released version 2.0.18.2 RC and ImpressCMS has released version 1.0.2.RC
It is highly recommended you upgrade to the most recent version of either XOOPS or ImpressCMS to better secure your web site.