Portal:Principiantes/Manter o Seu Site Joomla Seguro
From Joomla! Documentation
Security is always a big concern on the web. Make sure you are using best security practices. The basic techniques on the Security Check List will get your site off to a good start in terms of security. Here is a list of more information you should read.
Fóruns de Segurança do Joomla
Feeds de Segurança do Joomla